This semi-annual shareholder report contains important information about the TCW MetWest Low Duration Bond Fund for the period of April 1, 2025 to September 30, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.tcw.com/Literature/Fund-Literature. You can also request this information by contacting us at 800-FUND-TCW (800-386-3829).

Additional Information Phone Number

800-FUND-TCW (800-386-3829)

Additional Information Website

TCW MetWest Low Duration Bond Fund

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Class I	$22	0.44%^{Footnote Reference*}

Footnote	Description
Footnote^*	Annualized.

Expenses Paid, Amount

$ 22

Expense Ratio, Percent

0.44%

^[1]

AssetsNet

$ 892,374,566

Holdings Count | Holding

490

InvestmentCompanyPortfolioTurnover

248.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$892,374,566
# of Portfolio Holdings490
Portfolio Turnover Rate248%

Holdings [Text Block]

Asset Allocation (as a % of Net Assets)

Corporate Bonds	31.1%
Residential Mortgage-Backed Securities - Agency	28.2%
U.S. Treasury Securities	14.9%
Asset-Backed Securities	14.9%
Residential Mortgage-Backed Securities - Non-Agency	11.9%
Commercial Mortgage-Backed Securities - Non-Agency	8.7%
Short-Term Investments	7.8%
Bank Loans	1.3%
Other Security Types^{Footnote Reference*}	2.2%
Liabilities in Excess of Other Assets	(21.0%)

Footnote	Description
Footnote^*	Please refer to the Fund’s Semi-Annual Financial Statements which are available on the Fund’s website at www.tcw.com/Literature/Fund-Literature for a complete listing of all categories.

Largest Holdings [Text Block]

Top Ten Holdings (as a % of Net Assets)

U.S. Treasury Notes, 3.50%, due 09/30/27	10.0%
Uniform Mortgage-Backed Security, TBA, 5.00%, due 03/01/40	3.6%
Uniform Mortgage-Backed Security, TBA, 4.50%, due 04/01/40	3.4%
U.S. Treasury Notes, 3.63%, due 09/30/30	3.0%
Uniform Mortgage-Backed Security, TBA, 4.00%, due 09/01/37	2.2%
U.S. Treasury Notes, 3.38%, due 09/15/28	1.8%
JPMorgan Chase & Co., 1.04%, due 02/04/27 (3 mo. USD Term SOFR + 0.695%)	1.6%
Uniform Mortgage-Backed Security, TBA, 3.50%, due 02/01/37	1.5%
Government National Mortgage Association REMICS, Class FB, 5.54%, due 09/20/54 (30 day USD SOFR Average + 1.150%)	1.5%
Federal National Mortgage Association REMICS, Class FB, 5.56%, due 10/25/54 (30 day USD SOFR Average + 1.200%)	1.5%

Material Fund Change [Text Block]

Accountant Change Date

Sep. 30, 2025

C000003064

Shareholder Report [Line Items]

Fund Name

TCW MetWest Low Duration Bond Fund

Class Name

Class M

Trading Symbol

MWLDX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the TCW MetWest Low Duration Bond Fund for the period of April 1, 2025 to September 30, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.tcw.com/Literature/Fund-Literature. You can also request this information by contacting us at 800-FUND-TCW (800-386-3829).

Additional Information Phone Number

800-FUND-TCW (800-386-3829)

Additional Information Website

TCW MetWest Low Duration Bond Fund

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Class M	$32	0.63%^{Footnote Reference*}

Footnote	Description
Footnote^*	Annualized.

Expenses Paid, Amount

$ 32

Expense Ratio, Percent

0.63%

^[2]

AssetsNet

$ 892,374,566

Holdings Count | Holding

490

InvestmentCompanyPortfolioTurnover

248.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$892,374,566
# of Portfolio Holdings490
Portfolio Turnover Rate248%

Holdings [Text Block]

Asset Allocation (as a % of Net Assets)

Corporate Bonds	31.1%
Residential Mortgage-Backed Securities - Agency	28.2%
U.S. Treasury Securities	14.9%
Asset-Backed Securities	14.9%
Residential Mortgage-Backed Securities - Non-Agency	11.9%
Commercial Mortgage-Backed Securities - Non-Agency	8.7%
Short-Term Investments	7.8%
Bank Loans	1.3%
Other Security Types^{Footnote Reference*}	2.2%
Liabilities in Excess of Other Assets	(21.0%)

Footnote	Description
Footnote^*	Please refer to the Fund’s Semi-Annual Financial Statements which are available on the Fund’s website at www.tcw.com/Literature/Fund-Literature for a complete listing of all categories.

Largest Holdings [Text Block]

Top Ten Holdings (as a % of Net Assets)

U.S. Treasury Notes, 3.50%, due 09/30/27	10.0%
Uniform Mortgage-Backed Security, TBA, 5.00%, due 03/01/40	3.6%
Uniform Mortgage-Backed Security, TBA, 4.50%, due 04/01/40	3.4%
U.S. Treasury Notes, 3.63%, due 09/30/30	3.0%
Uniform Mortgage-Backed Security, TBA, 4.00%, due 09/01/37	2.2%
U.S. Treasury Notes, 3.38%, due 09/15/28	1.8%
JPMorgan Chase & Co., 1.04%, due 02/04/27 (3 mo. USD Term SOFR + 0.695%)	1.6%
Uniform Mortgage-Backed Security, TBA, 3.50%, due 02/01/37	1.5%
Government National Mortgage Association REMICS, Class FB, 5.54%, due 09/20/54 (30 day USD SOFR Average + 1.150%)	1.5%
Federal National Mortgage Association REMICS, Class FB, 5.56%, due 10/25/54 (30 day USD SOFR Average + 1.200%)	1.5%

Material Fund Change [Text Block]

Accountant Change Date

Sep. 30, 2025

C000058169

Shareholder Report [Line Items]

Fund Name

TCW MetWest Low Duration Bond Fund

Class Name

Administrative Class

Trading Symbol

MWLNX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the TCW MetWest Low Duration Bond Fund for the period of April 1, 2025 to September 30, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.tcw.com/Literature/Fund-Literature. You can also request this information by contacting us at 800-FUND-TCW (800-386-3829).

Additional Information Phone Number

800-FUND-TCW (800-386-3829)

Additional Information Website

TCW MetWest Low Duration Bond Fund

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Administrative Class	$41	0.80%^{Footnote Reference*}

Footnote	Description
Footnote^*	Annualized.

Expenses Paid, Amount

$ 41

Expense Ratio, Percent

0.80%

^[3]

AssetsNet

$ 892,374,566

Holdings Count | Holding

490

InvestmentCompanyPortfolioTurnover

248.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$892,374,566
# of Portfolio Holdings490
Portfolio Turnover Rate248%

Holdings [Text Block]

Asset Allocation (as a % of Net Assets)

Corporate Bonds	31.1%
Residential Mortgage-Backed Securities - Agency	28.2%
U.S. Treasury Securities	14.9%
Asset-Backed Securities	14.9%
Residential Mortgage-Backed Securities - Non-Agency	11.9%
Commercial Mortgage-Backed Securities - Non-Agency	8.7%
Short-Term Investments	7.8%
Bank Loans	1.3%
Other Security Types^{Footnote Reference*}	2.2%
Liabilities in Excess of Other Assets	(21.0%)

Footnote	Description
Footnote^*	Please refer to the Fund’s Semi-Annual Financial Statements which are available on the Fund’s website at www.tcw.com/Literature/Fund-Literature for a complete listing of all categories.

Largest Holdings [Text Block]

Top Ten Holdings (as a % of Net Assets)

U.S. Treasury Notes, 3.50%, due 09/30/27	10.0%
Uniform Mortgage-Backed Security, TBA, 5.00%, due 03/01/40	3.6%
Uniform Mortgage-Backed Security, TBA, 4.50%, due 04/01/40	3.4%
U.S. Treasury Notes, 3.63%, due 09/30/30	3.0%
Uniform Mortgage-Backed Security, TBA, 4.00%, due 09/01/37	2.2%
U.S. Treasury Notes, 3.38%, due 09/15/28	1.8%
JPMorgan Chase & Co., 1.04%, due 02/04/27 (3 mo. USD Term SOFR + 0.695%)	1.6%
Uniform Mortgage-Backed Security, TBA, 3.50%, due 02/01/37	1.5%
Government National Mortgage Association REMICS, Class FB, 5.54%, due 09/20/54 (30 day USD SOFR Average + 1.150%)	1.5%
Federal National Mortgage Association REMICS, Class FB, 5.56%, due 10/25/54 (30 day USD SOFR Average + 1.200%)	1.5%

Material Fund Change [Text Block]

Accountant Change Date

Sep. 30, 2025

C000263828

Shareholder Report [Line Items]

Fund Name

TCW MetWest Low Duration Bond Fund

Class Name

Class I-3

Trading Symbol

MWLZX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the TCW MetWest Low Duration Bond Fund for the period of August 26, 2025 (commencement of operations) to September 30, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.tcw.com/Literature/Fund-Literature. You can also request this information by contacting us at 800-FUND-TCW (800-386-3829).

Additional Information Phone Number

800-FUND-TCW (800-386-3829)

Additional Information Website

TCW MetWest Low Duration Bond Fund

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Class I-3	$5^{Footnote Reference+}	0.51%^{Footnote Reference*}

Footnote	Description
Footnote^*	Annualized.
Footnote⁺	The dollar amounts above reflect expenses paid since the commencement of operations. Expenses for the full reporting period would be higher.

Expenses Paid, Amount

$ 5

^[4]

Expense Ratio, Percent

0.51%

^[5]

Expenses Short Period Footnote [Text Block]

The dollar amounts above reflect expenses paid since the commencement of operations. Expenses for the full reporting period would be higher.

Performance Inception Date

Aug. 26, 2025

AssetsNet

$ 892,374,566

Holdings Count | Holding

490

InvestmentCompanyPortfolioTurnover

248.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$892,374,566
# of Portfolio Holdings490
Portfolio Turnover Rate248%

Holdings [Text Block]

Asset Allocation (as a % of Net Assets)

Corporate Bonds	31.1%
Residential Mortgage-Backed Securities - Agency	28.2%
U.S. Treasury Securities	14.9%
Asset-Backed Securities	14.9%
Residential Mortgage-Backed Securities - Non-Agency	11.9%
Commercial Mortgage-Backed Securities - Non-Agency	8.7%
Short-Term Investments	7.8%
Bank Loans	1.3%
Other Security Types^{Footnote Reference*}	2.2%
Liabilities in Excess of Other Assets	(21.0%)

Footnote	Description
Footnote^*	Please refer to the Fund’s Semi-Annual Financial Statements which are available on the Fund’s website at www.tcw.com/Literature/Fund-Literature for a complete listing of all categories.

Largest Holdings [Text Block]

Top Ten Holdings (as a % of Net Assets)

U.S. Treasury Notes, 3.50%, due 09/30/27	10.0%
Uniform Mortgage-Backed Security, TBA, 5.00%, due 03/01/40	3.6%
Uniform Mortgage-Backed Security, TBA, 4.50%, due 04/01/40	3.4%
U.S. Treasury Notes, 3.63%, due 09/30/30	3.0%
Uniform Mortgage-Backed Security, TBA, 4.00%, due 09/01/37	2.2%
U.S. Treasury Notes, 3.38%, due 09/15/28	1.8%
JPMorgan Chase & Co., 1.04%, due 02/04/27 (3 mo. USD Term SOFR + 0.695%)	1.6%
Uniform Mortgage-Backed Security, TBA, 3.50%, due 02/01/37	1.5%
Government National Mortgage Association REMICS, Class FB, 5.54%, due 09/20/54 (30 day USD SOFR Average + 1.150%)	1.5%
Federal National Mortgage Association REMICS, Class FB, 5.56%, due 10/25/54 (30 day USD SOFR Average + 1.200%)	1.5%

Material Fund Change [Text Block]

Accountant Change Date

Sep. 30, 2025

C000003065

Shareholder Report [Line Items]

Fund Name

TCW MetWest Total Return Bond Fund

Class Name

Class I

Trading Symbol

MWTIX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the TCW MetWest Total Return Bond Fund for the period of April 1, 2025 to September 30, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.tcw.com/Literature/Fund-Literature. You can also request this information by contacting us at 800-FUND-TCW (800-386-3829).

Additional Information Phone Number

800-FUND-TCW (800-386-3829)

Additional Information Website

TCW MetWest Total Return Bond Fund

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Class I	$23	0.46%^{Footnote Reference*}

Footnote	Description
Footnote^*	Annualized.

Expenses Paid, Amount

$ 23

Expense Ratio, Percent

0.46%

^[6]

AssetsNet

$ 32,373,239,771

Holdings Count | Holding

1,586

InvestmentCompanyPortfolioTurnover

193.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$32,373,239,771
# of Portfolio Holdings1,586
Portfolio Turnover Rate193%

Holdings [Text Block]

Asset Allocation (as a % of Net Assets)

Residential Mortgage-Backed Securities - Agency	35.5%
U.S. Treasury Securities	20.0%
Corporate Bonds	16.3%
Short-Term Investments	14.1%
Residential Mortgage-Backed Securities - Non-Agency	11.1%
Commercial Mortgage-Backed Securities - Non-Agency	4.3%
Asset-Backed Securities	3.6%
Bank Loans	1.8%
Other Security Types^{Footnote Reference*}	3.3%
Liabilities in Excess of Other Assets	(10.0%)

Footnote	Description
Footnote^*	Please refer to the Fund’s Semi-Annual Financial Statements which are available on the Fund’s website at www.tcw.com/Literature/Fund-Literature for a complete listing of all categories.

Largest Holdings [Text Block]

Top Ten Holdings (as a % of Net Assets)

U.S. Treasury Notes, 3.63%, due 09/30/30	7.0%
U.S. Treasury Bonds, 4.75%, due 08/15/55	3.5%
U.S. Treasury Notes, 3.88%, due 09/30/32	3.3%
U.S. Treasury Bonds, 4.88%, due 08/15/45	3.1%
U.S. Treasury Notes, 4.25%, due 08/15/35	2.3%
Government National Mortgage Association, TBA, 5.00%, due 04/01/55	1.2%
Government National Mortgage Association, TBA, 2.50%, due 12/01/51	1.1%
Federal National Mortgage Association, 4.00%, due 06/01/52	1.1%
Uniform Mortgage-Backed Security, TBA, 4.00%, due 02/01/52	1.0%
Federal National Mortgage Association, 2.00%, due 12/01/51	1.0%

Material Fund Change [Text Block]

Accountant Change Date

Sep. 30, 2025

C000003066

Shareholder Report [Line Items]

Fund Name

TCW MetWest Total Return Bond Fund

Class Name

Class M

Trading Symbol

MWTRX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the TCW MetWest Total Return Bond Fund for the period of April 1, 2025 to September 30, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.tcw.com/Literature/Fund-Literature. You can also request this information by contacting us at 800-FUND-TCW (800-386-3829).

Additional Information Phone Number

800-FUND-TCW (800-386-3829)

Additional Information Website

TCW MetWest Total Return Bond Fund

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Class M	$35	0.68%^{Footnote Reference*}

Footnote	Description
Footnote^*	Annualized.

Expenses Paid, Amount

$ 35

Expense Ratio, Percent

0.68%

^[7]

AssetsNet

$ 32,373,239,771

Holdings Count | Holding

1,586

InvestmentCompanyPortfolioTurnover

193.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$32,373,239,771
# of Portfolio Holdings1,586
Portfolio Turnover Rate193%

Holdings [Text Block]

Asset Allocation (as a % of Net Assets)

Residential Mortgage-Backed Securities - Agency	35.5%
U.S. Treasury Securities	20.0%
Corporate Bonds	16.3%
Short-Term Investments	14.1%
Residential Mortgage-Backed Securities - Non-Agency	11.1%
Commercial Mortgage-Backed Securities - Non-Agency	4.3%
Asset-Backed Securities	3.6%
Bank Loans	1.8%
Other Security Types^{Footnote Reference*}	3.3%
Liabilities in Excess of Other Assets	(10.0%)

Footnote	Description
Footnote^*	Please refer to the Fund’s Semi-Annual Financial Statements which are available on the Fund’s website at www.tcw.com/Literature/Fund-Literature for a complete listing of all categories.

Largest Holdings [Text Block]

Top Ten Holdings (as a % of Net Assets)

U.S. Treasury Notes, 3.63%, due 09/30/30	7.0%
U.S. Treasury Bonds, 4.75%, due 08/15/55	3.5%
U.S. Treasury Notes, 3.88%, due 09/30/32	3.3%
U.S. Treasury Bonds, 4.88%, due 08/15/45	3.1%
U.S. Treasury Notes, 4.25%, due 08/15/35	2.3%
Government National Mortgage Association, TBA, 5.00%, due 04/01/55	1.2%
Government National Mortgage Association, TBA, 2.50%, due 12/01/51	1.1%
Federal National Mortgage Association, 4.00%, due 06/01/52	1.1%
Uniform Mortgage-Backed Security, TBA, 4.00%, due 02/01/52	1.0%
Federal National Mortgage Association, 2.00%, due 12/01/51	1.0%

Material Fund Change [Text Block]

Accountant Change Date

Sep. 30, 2025

C000058170

Shareholder Report [Line Items]

Fund Name

TCW MetWest Total Return Bond Fund

Class Name

Administrative Class

Trading Symbol

MWTNX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the TCW MetWest Total Return Bond Fund for the period of April 1, 2025 to September 30, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.tcw.com/Literature/Fund-Literature. You can also request this information by contacting us at 800-FUND-TCW (800-386-3829).

Additional Information Phone Number

800-FUND-TCW (800-386-3829)

Additional Information Website

TCW MetWest Total Return Bond Fund

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Administrative Class	$40	0.79%^{Footnote Reference*}

Footnote	Description
Footnote^*	Annualized.

Expenses Paid, Amount

$ 40

Expense Ratio, Percent

0.79%

^[8]

AssetsNet

$ 32,373,239,771

Holdings Count | Holding

1,586

InvestmentCompanyPortfolioTurnover

193.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$32,373,239,771
# of Portfolio Holdings1,586
Portfolio Turnover Rate193%

Holdings [Text Block]

Asset Allocation (as a % of Net Assets)

Residential Mortgage-Backed Securities - Agency	35.5%
U.S. Treasury Securities	20.0%
Corporate Bonds	16.3%
Short-Term Investments	14.1%
Residential Mortgage-Backed Securities - Non-Agency	11.1%
Commercial Mortgage-Backed Securities - Non-Agency	4.3%
Asset-Backed Securities	3.6%
Bank Loans	1.8%
Other Security Types^{Footnote Reference*}	3.3%
Liabilities in Excess of Other Assets	(10.0%)

Footnote	Description
Footnote^*	Please refer to the Fund’s Semi-Annual Financial Statements which are available on the Fund’s website at www.tcw.com/Literature/Fund-Literature for a complete listing of all categories.

Largest Holdings [Text Block]

Top Ten Holdings (as a % of Net Assets)

U.S. Treasury Notes, 3.63%, due 09/30/30	7.0%
U.S. Treasury Bonds, 4.75%, due 08/15/55	3.5%
U.S. Treasury Notes, 3.88%, due 09/30/32	3.3%
U.S. Treasury Bonds, 4.88%, due 08/15/45	3.1%
U.S. Treasury Notes, 4.25%, due 08/15/35	2.3%
Government National Mortgage Association, TBA, 5.00%, due 04/01/55	1.2%
Government National Mortgage Association, TBA, 2.50%, due 12/01/51	1.1%
Federal National Mortgage Association, 4.00%, due 06/01/52	1.1%
Uniform Mortgage-Backed Security, TBA, 4.00%, due 02/01/52	1.0%
Federal National Mortgage Association, 2.00%, due 12/01/51	1.0%

Material Fund Change [Text Block]

Accountant Change Date

Sep. 30, 2025

C000102908

Shareholder Report [Line Items]

Fund Name

TCW MetWest Total Return Bond Fund

Class Name

Plan Class

Trading Symbol

MWTSX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the TCW MetWest Total Return Bond Fund for the period of April 1, 2025 to September 30, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.tcw.com/Literature/Fund-Literature. You can also request this information by contacting us at 800-FUND-TCW (800-386-3829).

Additional Information Phone Number

800-FUND-TCW (800-386-3829)

Additional Information Website

TCW MetWest Total Return Bond Fund

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Plan Class	$19	0.38%^{Footnote Reference*}

Footnote	Description
Footnote^*	Annualized.

Expenses Paid, Amount

$ 19

Expense Ratio, Percent

0.38%

^[9]

AssetsNet

$ 32,373,239,771

Holdings Count | Holding

1,586

InvestmentCompanyPortfolioTurnover

193.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$32,373,239,771
# of Portfolio Holdings1,586
Portfolio Turnover Rate193%

Holdings [Text Block]

Asset Allocation (as a % of Net Assets)

Residential Mortgage-Backed Securities - Agency	35.5%
U.S. Treasury Securities	20.0%
Corporate Bonds	16.3%
Short-Term Investments	14.1%
Residential Mortgage-Backed Securities - Non-Agency	11.1%
Commercial Mortgage-Backed Securities - Non-Agency	4.3%
Asset-Backed Securities	3.6%
Bank Loans	1.8%
Other Security Types^{Footnote Reference*}	3.3%
Liabilities in Excess of Other Assets	(10.0%)

Footnote	Description
Footnote^*	Please refer to the Fund’s Semi-Annual Financial Statements which are available on the Fund’s website at www.tcw.com/Literature/Fund-Literature for a complete listing of all categories.

Largest Holdings [Text Block]

Top Ten Holdings (as a % of Net Assets)

U.S. Treasury Notes, 3.63%, due 09/30/30	7.0%
U.S. Treasury Bonds, 4.75%, due 08/15/55	3.5%
U.S. Treasury Notes, 3.88%, due 09/30/32	3.3%
U.S. Treasury Bonds, 4.88%, due 08/15/45	3.1%
U.S. Treasury Notes, 4.25%, due 08/15/35	2.3%
Government National Mortgage Association, TBA, 5.00%, due 04/01/55	1.2%
Government National Mortgage Association, TBA, 2.50%, due 12/01/51	1.1%
Federal National Mortgage Association, 4.00%, due 06/01/52	1.1%
Uniform Mortgage-Backed Security, TBA, 4.00%, due 02/01/52	1.0%
Federal National Mortgage Association, 2.00%, due 12/01/51	1.0%

Material Fund Change [Text Block]

Accountant Change Date

Sep. 30, 2025

C000218401

Shareholder Report [Line Items]

Fund Name

TCW MetWest Total Return Bond Fund

Class Name

Class I-2

Trading Symbol

MWTTX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the TCW MetWest Total Return Bond Fund for the period of April 1, 2025 to September 30, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.tcw.com/Literature/Fund-Literature. You can also request this information by contacting us at 800-FUND-TCW (800-386-3829).

Additional Information Phone Number

800-FUND-TCW (800-386-3829)

Additional Information Website

TCW MetWest Total Return Bond Fund

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Class I-2	$27	0.53%^{Footnote Reference*}

Footnote	Description
Footnote^*	Annualized.

Expenses Paid, Amount

$ 27

Expense Ratio, Percent

0.53%

^[10]

AssetsNet

$ 32,373,239,771

Holdings Count | Holding

1,586

InvestmentCompanyPortfolioTurnover

193.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$32,373,239,771
# of Portfolio Holdings1,586
Portfolio Turnover Rate193%

Holdings [Text Block]

Asset Allocation (as a % of Net Assets)

Residential Mortgage-Backed Securities - Agency	35.5%
U.S. Treasury Securities	20.0%
Corporate Bonds	16.3%
Short-Term Investments	14.1%
Residential Mortgage-Backed Securities - Non-Agency	11.1%
Commercial Mortgage-Backed Securities - Non-Agency	4.3%
Asset-Backed Securities	3.6%
Bank Loans	1.8%
Other Security Types^{Footnote Reference*}	3.3%
Liabilities in Excess of Other Assets	(10.0%)

Footnote	Description
Footnote^*	Please refer to the Fund’s Semi-Annual Financial Statements which are available on the Fund’s website at www.tcw.com/Literature/Fund-Literature for a complete listing of all categories.

Largest Holdings [Text Block]

Top Ten Holdings (as a % of Net Assets)

U.S. Treasury Notes, 3.63%, due 09/30/30	7.0%
U.S. Treasury Bonds, 4.75%, due 08/15/55	3.5%
U.S. Treasury Notes, 3.88%, due 09/30/32	3.3%
U.S. Treasury Bonds, 4.88%, due 08/15/45	3.1%
U.S. Treasury Notes, 4.25%, due 08/15/35	2.3%
Government National Mortgage Association, TBA, 5.00%, due 04/01/55	1.2%
Government National Mortgage Association, TBA, 2.50%, due 12/01/51	1.1%
Federal National Mortgage Association, 4.00%, due 06/01/52	1.1%
Uniform Mortgage-Backed Security, TBA, 4.00%, due 02/01/52	1.0%
Federal National Mortgage Association, 2.00%, due 12/01/51	1.0%

Material Fund Change [Text Block]

Accountant Change Date

Sep. 30, 2025

C000263829

Shareholder Report [Line Items]

Fund Name

TCW MetWest Total Return Bond Fund

Class Name

Class I-3

Trading Symbol

MWTZX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the TCW MetWest Total Return Bond Fund for the period of August 26, 2025 (commencement of operations) to September 30, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.tcw.com/Literature/Fund-Literature. You can also request this information by contacting us at 800-FUND-TCW (800-386-3829).

Additional Information Phone Number

800-FUND-TCW (800-386-3829)

Additional Information Website

TCW MetWest Total Return Bond Fund

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Class I-3	$6^{Footnote Reference+}	0.57%^{Footnote Reference*}

Footnote	Description
Footnote^*	Annualized.
Footnote⁺	The dollar amounts above reflect expenses paid since the commencement of operations. Expenses for the full reporting period would be higher.

Expenses Paid, Amount

$ 6

^[11]

Expense Ratio, Percent

0.57%

^[12]

Expenses Short Period Footnote [Text Block]

The dollar amounts above reflect expenses paid since the commencement of operations. Expenses for the full reporting period would be higher.

Performance Inception Date

Aug. 26, 2025

AssetsNet

$ 32,373,239,771

Holdings Count | Holding

1,586

InvestmentCompanyPortfolioTurnover

193.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$32,373,239,771
# of Portfolio Holdings1,586
Portfolio Turnover Rate193%

Holdings [Text Block]

Asset Allocation (as a % of Net Assets)

Residential Mortgage-Backed Securities - Agency	35.5%
U.S. Treasury Securities	20.0%
Corporate Bonds	16.3%
Short-Term Investments	14.1%
Residential Mortgage-Backed Securities - Non-Agency	11.1%
Commercial Mortgage-Backed Securities - Non-Agency	4.3%
Asset-Backed Securities	3.6%
Bank Loans	1.8%
Other Security Types^{Footnote Reference*}	3.3%
Liabilities in Excess of Other Assets	(10.0%)

Footnote	Description
Footnote^*	Please refer to the Fund’s Semi-Annual Financial Statements which are available on the Fund’s website at www.tcw.com/Literature/Fund-Literature for a complete listing of all categories.

Largest Holdings [Text Block]

Top Ten Holdings (as a % of Net Assets)

U.S. Treasury Notes, 3.63%, due 09/30/30	7.0%
U.S. Treasury Bonds, 4.75%, due 08/15/55	3.5%
U.S. Treasury Notes, 3.88%, due 09/30/32	3.3%
U.S. Treasury Bonds, 4.88%, due 08/15/45	3.1%
U.S. Treasury Notes, 4.25%, due 08/15/35	2.3%
Government National Mortgage Association, TBA, 5.00%, due 04/01/55	1.2%
Government National Mortgage Association, TBA, 2.50%, due 12/01/51	1.1%
Federal National Mortgage Association, 4.00%, due 06/01/52	1.1%
Uniform Mortgage-Backed Security, TBA, 4.00%, due 02/01/52	1.0%
Federal National Mortgage Association, 2.00%, due 12/01/51	1.0%

Material Fund Change [Text Block]

Accountant Change Date

Sep. 30, 2025

C000003068

Shareholder Report [Line Items]

Fund Name

TCW MetWest High Yield Bond Fund

Class Name

Class I

Trading Symbol

MWHIX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the TCW MetWest High Yield Bond Fund for the period of April 1, 2025 to September 30, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.tcw.com/Literature/Fund-Literature. You can also request this information by contacting us at 800-FUND-TCW (800-386-3829).

Additional Information Phone Number

800-FUND-TCW (800-386-3829)

Additional Information Website

TCW MetWest High Yield Bond Fund

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Class I	$31	0.60%^{Footnote Reference*}

Footnote	Description
Footnote^*	Annualized.

Expenses Paid, Amount

$ 31

Expense Ratio, Percent

0.60%

^[13]

AssetsNet

$ 430,302,725

Holdings Count | Holding

329

InvestmentCompanyPortfolioTurnover

58.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$430,302,725
# of Portfolio Holdings329
Portfolio Turnover Rate58%

Holdings [Text Block]

Asset Allocation (as a % of Net Assets)

Corporate Bonds	85.1%
Bank Loans	11.0%
Short-Term Investments	4.1%
Convertible Corporate Bonds	0.1%
Common Stock	0.0%
Warrants	0.0%
Liabilities in Excess of Other Assets	(0.3%)

Largest Holdings [Text Block]

Top Ten Holdings (as a % of Net Assets)

CSC Holdings LLC, 6.50%, due 02/01/29	1.2%
Wynn Las Vegas LLC/Wynn Las Vegas Capital Corp., 5.25%, due 05/15/27	1.1%
Sunoco LP, 7.88%, due 09/18/30 (5 yr. CMT + 4.230%)	1.0%
TransDigm, Inc., 6.38%, due 03/01/29	1.0%
Jane Street Group/JSG Finance, Inc., 6.13%, due 11/01/32	1.0%
Tenet Healthcare Corp., 4.63%, due 06/15/28	0.9%
Warnermedia Holdings, Inc., 5.05%, due 03/15/42	0.8%
1261229 BC Ltd., 10.00%, due 04/15/32	0.8%
American Electric Power Co., Inc., 6.05%, due 03/15/56 (5 yr. CMT + 1.940%)	0.8%
PNC Financial Services Group, Inc., 3.40%, due 09/15/26 (5 yr. CMT + 2.595%)	0.8%

Material Fund Change [Text Block]

Accountant Change Date

Sep. 30, 2025

C000003069

Shareholder Report [Line Items]

Fund Name

TCW MetWest High Yield Bond Fund

Class Name

Class M

Trading Symbol

MWHYX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the TCW MetWest High Yield Bond Fund for the period of April 1, 2025 to September 30, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.tcw.com/Literature/Fund-Literature. You can also request this information by contacting us at 800-FUND-TCW (800-386-3829).

Additional Information Phone Number

800-FUND-TCW (800-386-3829)

Additional Information Website

TCW MetWest High Yield Bond Fund

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Class M	$44	0.85%^{Footnote Reference*}

Footnote	Description
Footnote^*	Annualized.

Expenses Paid, Amount

$ 44

Expense Ratio, Percent

0.85%

^[14]

AssetsNet

$ 430,302,725

Holdings Count | Holding

329

InvestmentCompanyPortfolioTurnover

58.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$430,302,725
# of Portfolio Holdings329
Portfolio Turnover Rate58%

Holdings [Text Block]

Asset Allocation (as a % of Net Assets)

Corporate Bonds	85.1%
Bank Loans	11.0%
Short-Term Investments	4.1%
Convertible Corporate Bonds	0.1%
Common Stock	0.0%
Warrants	0.0%
Liabilities in Excess of Other Assets	(0.3%)

Largest Holdings [Text Block]

Top Ten Holdings (as a % of Net Assets)

CSC Holdings LLC, 6.50%, due 02/01/29	1.2%
Wynn Las Vegas LLC/Wynn Las Vegas Capital Corp., 5.25%, due 05/15/27	1.1%
Sunoco LP, 7.88%, due 09/18/30 (5 yr. CMT + 4.230%)	1.0%
TransDigm, Inc., 6.38%, due 03/01/29	1.0%
Jane Street Group/JSG Finance, Inc., 6.13%, due 11/01/32	1.0%
Tenet Healthcare Corp., 4.63%, due 06/15/28	0.9%
Warnermedia Holdings, Inc., 5.05%, due 03/15/42	0.8%
1261229 BC Ltd., 10.00%, due 04/15/32	0.8%
American Electric Power Co., Inc., 6.05%, due 03/15/56 (5 yr. CMT + 1.940%)	0.8%
PNC Financial Services Group, Inc., 3.40%, due 09/15/26 (5 yr. CMT + 2.595%)	0.8%

Material Fund Change [Text Block]

Accountant Change Date

Sep. 30, 2025

C000263830

Shareholder Report [Line Items]

Fund Name

TCW MetWest High Yield Bond Fund

Class Name

Class I-3

Trading Symbol

MWHZX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the TCW MetWest High Yield Bond Fund for the period of August 26, 2025 (commencement of operations) to September 30, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.tcw.com/Literature/Fund-Literature. You can also request this information by contacting us at 800-FUND-TCW (800-386-3829).

Additional Information Phone Number

800-FUND-TCW (800-386-3829)

Additional Information Website

TCW MetWest High Yield Bond Fund

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Class I-3	$7^{Footnote Reference+}	0.73%^{Footnote Reference*}

Footnote	Description
Footnote^*	Annualized.
Footnote⁺	The dollar amounts above reflect expenses paid since the commencement of operations. Expenses for the full reporting period would be higher.

Expenses Paid, Amount

$ 7

^[15]

Expense Ratio, Percent

0.73%

^[16]

Expenses Short Period Footnote [Text Block]

The dollar amounts above reflect expenses paid since the commencement of operations. Expenses for the full reporting period would be higher.

Performance Inception Date

Aug. 26, 2025

AssetsNet

$ 430,302,725

Holdings Count | Holding

329

InvestmentCompanyPortfolioTurnover

58.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$430,302,725
# of Portfolio Holdings329
Portfolio Turnover Rate58%

Holdings [Text Block]

Asset Allocation (as a % of Net Assets)

Corporate Bonds	85.1%
Bank Loans	11.0%
Short-Term Investments	4.1%
Convertible Corporate Bonds	0.1%
Common Stock	0.0%
Warrants	0.0%
Liabilities in Excess of Other Assets	(0.3%)

Largest Holdings [Text Block]

Top Ten Holdings (as a % of Net Assets)

CSC Holdings LLC, 6.50%, due 02/01/29	1.2%
Wynn Las Vegas LLC/Wynn Las Vegas Capital Corp., 5.25%, due 05/15/27	1.1%
Sunoco LP, 7.88%, due 09/18/30 (5 yr. CMT + 4.230%)	1.0%
TransDigm, Inc., 6.38%, due 03/01/29	1.0%
Jane Street Group/JSG Finance, Inc., 6.13%, due 11/01/32	1.0%
Tenet Healthcare Corp., 4.63%, due 06/15/28	0.9%
Warnermedia Holdings, Inc., 5.05%, due 03/15/42	0.8%
1261229 BC Ltd., 10.00%, due 04/15/32	0.8%
American Electric Power Co., Inc., 6.05%, due 03/15/56 (5 yr. CMT + 1.940%)	0.8%
PNC Financial Services Group, Inc., 3.40%, due 09/15/26 (5 yr. CMT + 2.595%)	0.8%

Material Fund Change [Text Block]

Accountant Change Date

Sep. 30, 2025

C000003072

Shareholder Report [Line Items]

Fund Name

TCW MetWest Ultra Short Bond Fund

Class Name

Class I

Trading Symbol

MWUIX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the TCW MetWest Ultra Short Bond Fund for the period of April 1, 2025 to September 30, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.tcw.com/Literature/Fund-Literature. You can also request this information by contacting us at 800-FUND-TCW (800-386-3829).

Additional Information Phone Number

800-FUND-TCW (800-386-3829)

Additional Information Website

TCW MetWest Ultra Short Bond Fund

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Class I	$17	0.34%^{Footnote Reference*}

Footnote	Description
Footnote^*	Annualized.

Expenses Paid, Amount

$ 17

Expense Ratio, Percent

0.34%

^[17]

AssetsNet

$ 41,854,147

Holdings Count | Holding

230

InvestmentCompanyPortfolioTurnover

297.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$41,854,147
# of Portfolio Holdings230
Portfolio Turnover Rate297%

Holdings [Text Block]

Asset Allocation (as a % of Net Assets)

Residential Mortgage-Backed Securities - Agency	27.9%
Corporate Bonds	27.3%
U.S. Treasury Securities	22.2%
Asset-Backed Securities	13.3%
Short-Term Investments	13.2%
Commercial Mortgage-Backed Securities - Non-Agency	7.6%
Residential Mortgage-Backed Securities - Non-Agency	5.2%
U.S. Government Agency Obligations	3.8%
Other Security Types^{Footnote Reference*}	1.4%
Liabilities in Excess of Other Assets	(21.9%)

Footnote	Description
Footnote^*	Please refer to the Fund’s Semi-Annual Financial Statements which are available on the Fund’s website at www.tcw.com/Literature/Fund-Literature for a complete listing of all categories.

Largest Holdings [Text Block]

Top Ten Holdings (as a % of Net Assets)

U.S. Treasury Notes, 3.50%, due 09/30/27	16.9%
U.S. International Development Finance Corp., 1.49%, due 08/15/31	3.8%
Uniform Mortgage-Backed Security, TBA, 5.00%, due 03/01/40	3.7%
U.S. Treasury Notes, 3.63%, due 09/30/30	3.4%
Uniform Mortgage-Backed Security, TBA, 4.50%, due 04/01/40	3.4%
JPMorgan Chase & Co., 1.04%, due 02/04/27 (3 mo. USD Term SOFR + 0.695%)	2.8%
Uniform Mortgage-Backed Security, TBA, 4.00%, due 09/01/37	2.4%
Bank of America Corp., 3.82%, due 01/20/28 (3 mo. USD Term SOFR + 1.837%)	2.3%
U.S. Treasury Notes, 3.38%, due 09/15/28	1.9%
Citigroup, Inc., 1.46%, due 06/09/27 (1 day USD SOFR + 0.770%)	1.9%

Material Fund Change [Text Block]

Accountant Change Date

Sep. 30, 2025

C000003073

Shareholder Report [Line Items]

Fund Name

TCW MetWest Ultra Short Bond Fund

Class Name

Class M

Trading Symbol

MWUSX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the TCW MetWest Ultra Short Bond Fund for the period of April 1, 2025 to September 30, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.tcw.com/Literature/Fund-Literature. You can also request this information by contacting us at 800-FUND-TCW (800-386-3829).

Additional Information Phone Number

800-FUND-TCW (800-386-3829)

Additional Information Website

TCW MetWest Ultra Short Bond Fund

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Class M	$25	0.50%^{Footnote Reference*}

Footnote	Description
Footnote^*	Annualized.

Expenses Paid, Amount

$ 25

Expense Ratio, Percent

0.50%

^[18]

AssetsNet

$ 41,854,147

Holdings Count | Holding

230

InvestmentCompanyPortfolioTurnover

297.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$41,854,147
# of Portfolio Holdings230
Portfolio Turnover Rate297%

Holdings [Text Block]

Asset Allocation (as a % of Net Assets)

Residential Mortgage-Backed Securities - Agency	27.9%
Corporate Bonds	27.3%
U.S. Treasury Securities	22.2%
Asset-Backed Securities	13.3%
Short-Term Investments	13.2%
Commercial Mortgage-Backed Securities - Non-Agency	7.6%
Residential Mortgage-Backed Securities - Non-Agency	5.2%
U.S. Government Agency Obligations	3.8%
Other Security Types^{Footnote Reference*}	1.4%
Liabilities in Excess of Other Assets	(21.9%)

Footnote	Description
Footnote^*	Please refer to the Fund’s Semi-Annual Financial Statements which are available on the Fund’s website at www.tcw.com/Literature/Fund-Literature for a complete listing of all categories.

Largest Holdings [Text Block]

Top Ten Holdings (as a % of Net Assets)

U.S. Treasury Notes, 3.50%, due 09/30/27	16.9%
U.S. International Development Finance Corp., 1.49%, due 08/15/31	3.8%
Uniform Mortgage-Backed Security, TBA, 5.00%, due 03/01/40	3.7%
U.S. Treasury Notes, 3.63%, due 09/30/30	3.4%
Uniform Mortgage-Backed Security, TBA, 4.50%, due 04/01/40	3.4%
JPMorgan Chase & Co., 1.04%, due 02/04/27 (3 mo. USD Term SOFR + 0.695%)	2.8%
Uniform Mortgage-Backed Security, TBA, 4.00%, due 09/01/37	2.4%
Bank of America Corp., 3.82%, due 01/20/28 (3 mo. USD Term SOFR + 1.837%)	2.3%
U.S. Treasury Notes, 3.38%, due 09/15/28	1.9%
Citigroup, Inc., 1.46%, due 06/09/27 (1 day USD SOFR + 0.770%)	1.9%

Material Fund Change [Text Block]

Accountant Change Date

Sep. 30, 2025

C000003074

Shareholder Report [Line Items]

Fund Name

TCW MetWest Strategic Income Fund

Class Name

Class I

Trading Symbol

MWSIX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the TCW MetWest Strategic Income Fund for the period of April 1, 2025 to September 30, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.tcw.com/Literature/Fund-Literature. You can also request this information by contacting us at 800-FUND-TCW (800-386-3829).

Additional Information Phone Number

800-FUND-TCW (800-386-3829)

Additional Information Website

TCW MetWest Strategic Income Fund

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Class I	$41	0.80%^{Footnote Reference*}

Footnote	Description
Footnote^*	Annualized.

Expenses Paid, Amount

$ 41

Expense Ratio, Percent

0.80%

^[19]

AssetsNet

$ 59,962,424

Holdings Count | Holding

569

InvestmentCompanyPortfolioTurnover

154.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$59,962,424
# of Portfolio Holdings569
Portfolio Turnover Rate154%

Holdings [Text Block]

Asset Allocation (as a % of Net Assets)

Residential Mortgage-Backed Securities - Non-Agency	29.2%
Corporate Bonds	25.5%
Residential Mortgage-Backed Securities - Agency	16.4%
Commercial Mortgage-Backed Securities - Non-Agency	16.1%
Asset-Backed Securities	11.7%
U.S. Treasury Securities	4.6%
Short-Term Investments	2.5%
Investment Companies	1.4%
Other Security Types^{Footnote Reference*}	1.7%
Liabilities in Excess of Other Assets	(9.1%)

Footnote	Description
Footnote^*	Please refer to the Fund’s Semi-Annual Financial Statements which are available on the Fund’s website at www.tcw.com/Literature/Fund-Literature for a complete listing of all categories.

Largest Holdings [Text Block]

Top Ten Holdings (as a % of Net Assets)

U.S. Treasury Notes, 3.63%, due 09/30/30	4.4%
TCW Private Asset Income Fund, Class I	1.4%
Uniform Mortgage-Backed Security, TBA, 5.00%, due 03/01/55	1.4%
Government National Mortgage Association, TBA, 5.50%, due 04/01/55	1.3%
Federal Home Loan Mortgage Corp., 4.50%, due 09/01/52	1.1%
Government National Mortgage Association, TBA, 5.00%, due 04/01/55	1.0%
Goldman Sachs Group, Inc., 1.09%, due 12/09/26 (1 day USD SOFR + 0.789%)	1.0%
Uniform Mortgage-Backed Security, TBA, 3.50%, due 01/01/52	0.9%
Uniform Mortgage-Backed Security, TBA, 4.00%, due 02/01/52	0.9%
Government National Mortgage Association, TBA, 4.00%, due 05/01/52	0.9%

Material Fund Change [Text Block]

Accountant Change Date

Sep. 30, 2025

C000003075

Shareholder Report [Line Items]

Fund Name

TCW MetWest Strategic Income Fund

Class Name

Class M

Trading Symbol

MWSTX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the TCW MetWest Strategic Income Fund for the period of April 1, 2025 to September 30, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.tcw.com/Literature/Fund-Literature. You can also request this information by contacting us at 800-FUND-TCW (800-386-3829).

Additional Information Phone Number

800-FUND-TCW (800-386-3829)

Additional Information Website

TCW MetWest Strategic Income Fund

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Class M	$53	1.04%^{Footnote Reference*}

Footnote	Description
Footnote^*	Annualized.

Expenses Paid, Amount

$ 53

Expense Ratio, Percent

1.04%

^[20]

AssetsNet

$ 59,962,424

Holdings Count | Holding

569

InvestmentCompanyPortfolioTurnover

154.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$59,962,424
# of Portfolio Holdings569
Portfolio Turnover Rate154%

Holdings [Text Block]

Asset Allocation (as a % of Net Assets)

Residential Mortgage-Backed Securities - Non-Agency	29.2%
Corporate Bonds	25.5%
Residential Mortgage-Backed Securities - Agency	16.4%
Commercial Mortgage-Backed Securities - Non-Agency	16.1%
Asset-Backed Securities	11.7%
U.S. Treasury Securities	4.6%
Short-Term Investments	2.5%
Investment Companies	1.4%
Other Security Types^{Footnote Reference*}	1.7%
Liabilities in Excess of Other Assets	(9.1%)

Footnote	Description
Footnote^*	Please refer to the Fund’s Semi-Annual Financial Statements which are available on the Fund’s website at www.tcw.com/Literature/Fund-Literature for a complete listing of all categories.

Largest Holdings [Text Block]

Top Ten Holdings (as a % of Net Assets)

U.S. Treasury Notes, 3.63%, due 09/30/30	4.4%
TCW Private Asset Income Fund, Class I	1.4%
Uniform Mortgage-Backed Security, TBA, 5.00%, due 03/01/55	1.4%
Government National Mortgage Association, TBA, 5.50%, due 04/01/55	1.3%
Federal Home Loan Mortgage Corp., 4.50%, due 09/01/52	1.1%
Government National Mortgage Association, TBA, 5.00%, due 04/01/55	1.0%
Goldman Sachs Group, Inc., 1.09%, due 12/09/26 (1 day USD SOFR + 0.789%)	1.0%
Uniform Mortgage-Backed Security, TBA, 3.50%, due 01/01/52	0.9%
Uniform Mortgage-Backed Security, TBA, 4.00%, due 02/01/52	0.9%
Government National Mortgage Association, TBA, 4.00%, due 05/01/52	0.9%

Material Fund Change [Text Block]

Accountant Change Date

Sep. 30, 2025

C000105186

Shareholder Report [Line Items]

Fund Name

TCW MetWest Unconstrained Bond Fund

Class Name

Class I

Trading Symbol

MWCIX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the TCW MetWest Unconstrained Bond Fund for the period of April 1, 2025 to September 30, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.tcw.com/Literature/Fund-Literature. You can also request this information by contacting us at 800-FUND-TCW (800-386-3829).

Additional Information Phone Number

800-FUND-TCW (800-386-3829)

Additional Information Website

TCW MetWest Unconstrained Bond Fund

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Class I	$38	0.74%^{Footnote Reference*}

Footnote	Description
Footnote^*	Annualized.

Expenses Paid, Amount

$ 38

Expense Ratio, Percent

0.74%

^[21]

AssetsNet

$ 2,752,442,737

Holdings Count | Holding

937

InvestmentCompanyPortfolioTurnover

131.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$2,752,442,737
# of Portfolio Holdings937
Portfolio Turnover Rate131%

Holdings [Text Block]

Asset Allocation (as a % of Net Assets)

Residential Mortgage-Backed Securities - Non-Agency	27.2%
Residential Mortgage-Backed Securities - Agency	21.8%
Corporate Bonds	17.6%
Commercial Mortgage-Backed Securities - Non-Agency	12.6%
Asset-Backed Securities	11.3%
U.S. Treasury Securities	8.3%
Bank Loans	3.7%
Foreign Government Bonds	2.2%
Other Security Types^{Footnote Reference*}	5.5%
Liabilities in Excess of Other Assets	(10.2%)

Footnote	Description
Footnote^*	Please refer to the Fund’s Semi-Annual Financial Statements which are available on the Fund’s website at www.tcw.com/Literature/Fund-Literature for a complete listing of all categories.

Largest Holdings [Text Block]

Top Ten Holdings (as a % of Net Assets)

U.S. Treasury Notes, 3.63%, due 09/30/30	7.2%
Uniform Mortgage-Backed Security, TBA, 5.00%, due 03/01/55	1.8%
Government National Mortgage Association, TBA, 5.50%, due 04/01/55	1.5%
Uniform Mortgage-Backed Security, TBA, 4.00%, due 02/01/52	1.4%
TCW Private Asset Income Fund, Class I	1.3%
Government National Mortgage Association, TBA, 5.00%, due 04/01/55	1.2%
U.S. Treasury Notes, 3.50%, due 09/30/27	1.1%
Federal Home Loan Mortgage Corp., 4.50%, due 12/01/52	1.1%
Government National Mortgage Association, TBA, 3.50%, due 02/01/52	0.9%
Federal Home Loan Mortgage Corp., 4.00%, due 11/01/52	0.8%

Material Fund Change [Text Block]

Accountant Change Date

Sep. 30, 2025

C000105185

Shareholder Report [Line Items]

Fund Name

TCW MetWest Unconstrained Bond Fund

Class Name

Class M

Trading Symbol

MWCRX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the TCW MetWest Unconstrained Bond Fund for the period of April 1, 2025 to September 30, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.tcw.com/Literature/Fund-Literature. You can also request this information by contacting us at 800-FUND-TCW (800-386-3829).

Additional Information Phone Number

800-FUND-TCW (800-386-3829)

Additional Information Website

TCW MetWest Unconstrained Bond Fund

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Class M	$53	1.03%^{Footnote Reference*}

Footnote	Description
Footnote^*	Annualized.

Expenses Paid, Amount

$ 53

Expense Ratio, Percent

1.03%

^[22]

AssetsNet

$ 2,752,442,737

Holdings Count | Holding

937

InvestmentCompanyPortfolioTurnover

131.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$2,752,442,737
# of Portfolio Holdings937
Portfolio Turnover Rate131%

Holdings [Text Block]

Asset Allocation (as a % of Net Assets)

Residential Mortgage-Backed Securities - Non-Agency	27.2%
Residential Mortgage-Backed Securities - Agency	21.8%
Corporate Bonds	17.6%
Commercial Mortgage-Backed Securities - Non-Agency	12.6%
Asset-Backed Securities	11.3%
U.S. Treasury Securities	8.3%
Bank Loans	3.7%
Foreign Government Bonds	2.2%
Other Security Types^{Footnote Reference*}	5.5%
Liabilities in Excess of Other Assets	(10.2%)

Footnote	Description
Footnote^*	Please refer to the Fund’s Semi-Annual Financial Statements which are available on the Fund’s website at www.tcw.com/Literature/Fund-Literature for a complete listing of all categories.

Largest Holdings [Text Block]

Top Ten Holdings (as a % of Net Assets)

U.S. Treasury Notes, 3.63%, due 09/30/30	7.2%
Uniform Mortgage-Backed Security, TBA, 5.00%, due 03/01/55	1.8%
Government National Mortgage Association, TBA, 5.50%, due 04/01/55	1.5%
Uniform Mortgage-Backed Security, TBA, 4.00%, due 02/01/52	1.4%
TCW Private Asset Income Fund, Class I	1.3%
Government National Mortgage Association, TBA, 5.00%, due 04/01/55	1.2%
U.S. Treasury Notes, 3.50%, due 09/30/27	1.1%
Federal Home Loan Mortgage Corp., 4.50%, due 12/01/52	1.1%
Government National Mortgage Association, TBA, 3.50%, due 02/01/52	0.9%
Federal Home Loan Mortgage Corp., 4.00%, due 11/01/52	0.8%

Material Fund Change [Text Block]

Accountant Change Date

Sep. 30, 2025

C000218402

Shareholder Report [Line Items]

Fund Name

TCW MetWest Unconstrained Bond Fund

Class Name

Plan Class

Trading Symbol

MWCPX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the TCW MetWest Unconstrained Bond Fund for the period of April 1, 2025 to September 30, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.tcw.com/Literature/Fund-Literature. You can also request this information by contacting us at 800-FUND-TCW (800-386-3829).

Additional Information Phone Number

800-FUND-TCW (800-386-3829)

Additional Information Website

TCW MetWest Unconstrained Bond Fund

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Plan Class	$35	0.68%^{Footnote Reference*}

Footnote	Description
Footnote^*	Annualized.

Expenses Paid, Amount

$ 35

Expense Ratio, Percent

0.68%

^[23]

AssetsNet

$ 2,752,442,737

Holdings Count | Holding

937

InvestmentCompanyPortfolioTurnover

131.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$2,752,442,737
# of Portfolio Holdings937
Portfolio Turnover Rate131%

Holdings [Text Block]

Asset Allocation (as a % of Net Assets)

Residential Mortgage-Backed Securities - Non-Agency	27.2%
Residential Mortgage-Backed Securities - Agency	21.8%
Corporate Bonds	17.6%
Commercial Mortgage-Backed Securities - Non-Agency	12.6%
Asset-Backed Securities	11.3%
U.S. Treasury Securities	8.3%
Bank Loans	3.7%
Foreign Government Bonds	2.2%
Other Security Types^{Footnote Reference*}	5.5%
Liabilities in Excess of Other Assets	(10.2%)

Footnote	Description
Footnote^*	Please refer to the Fund’s Semi-Annual Financial Statements which are available on the Fund’s website at www.tcw.com/Literature/Fund-Literature for a complete listing of all categories.

Largest Holdings [Text Block]

Top Ten Holdings (as a % of Net Assets)

U.S. Treasury Notes, 3.63%, due 09/30/30	7.2%
Uniform Mortgage-Backed Security, TBA, 5.00%, due 03/01/55	1.8%
Government National Mortgage Association, TBA, 5.50%, due 04/01/55	1.5%
Uniform Mortgage-Backed Security, TBA, 4.00%, due 02/01/52	1.4%
TCW Private Asset Income Fund, Class I	1.3%
Government National Mortgage Association, TBA, 5.00%, due 04/01/55	1.2%
U.S. Treasury Notes, 3.50%, due 09/30/27	1.1%
Federal Home Loan Mortgage Corp., 4.50%, due 12/01/52	1.1%
Government National Mortgage Association, TBA, 3.50%, due 02/01/52	0.9%
Federal Home Loan Mortgage Corp., 4.00%, due 11/01/52	0.8%

Material Fund Change [Text Block]

Accountant Change Date

Sep. 30, 2025

C000263831

Shareholder Report [Line Items]

Fund Name

TCW MetWest Unconstrained Bond Fund

Class Name

Class I-3

Trading Symbol

MWCZX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the TCW MetWest Unconstrained Bond Fund for the period of August 26, 2025 (commencement of operations) to September 30, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.tcw.com/Literature/Fund-Literature. You can also request this information by contacting us at 800-FUND-TCW (800-386-3829).

Additional Information Phone Number

800-FUND-TCW (800-386-3829)

Additional Information Website

TCW MetWest Unconstrained Bond Fund

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Class I-3	$2^{Footnote Reference+}	0.23%^{Footnote Reference*}

Footnote	Description
Footnote^*	Annualized.
Footnote⁺	The dollar amounts above reflect expenses paid since the commencement of operations. Expenses for the full reporting period would be higher.

Expenses Paid, Amount

$ 2

^[24]

Expense Ratio, Percent

0.23%

^[25]

Expenses Short Period Footnote [Text Block]

The dollar amounts above reflect expenses paid since the commencement of operations. Expenses for the full reporting period would be higher.

Performance Inception Date

Aug. 26, 2025

AssetsNet

$ 2,752,442,737

Holdings Count | Holding

937

InvestmentCompanyPortfolioTurnover

131.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$2,752,442,737
# of Portfolio Holdings937
Portfolio Turnover Rate131%

Holdings [Text Block]

Asset Allocation (as a % of Net Assets)

Residential Mortgage-Backed Securities - Non-Agency	27.2%
Residential Mortgage-Backed Securities - Agency	21.8%
Corporate Bonds	17.6%
Commercial Mortgage-Backed Securities - Non-Agency	12.6%
Asset-Backed Securities	11.3%
U.S. Treasury Securities	8.3%
Bank Loans	3.7%
Foreign Government Bonds	2.2%
Other Security Types^{Footnote Reference*}	5.5%
Liabilities in Excess of Other Assets	(10.2%)

Footnote	Description
Footnote^*	Please refer to the Fund’s Semi-Annual Financial Statements which are available on the Fund’s website at www.tcw.com/Literature/Fund-Literature for a complete listing of all categories.

Largest Holdings [Text Block]

Top Ten Holdings (as a % of Net Assets)

U.S. Treasury Notes, 3.63%, due 09/30/30	7.2%
Uniform Mortgage-Backed Security, TBA, 5.00%, due 03/01/55	1.8%
Government National Mortgage Association, TBA, 5.50%, due 04/01/55	1.5%
Uniform Mortgage-Backed Security, TBA, 4.00%, due 02/01/52	1.4%
TCW Private Asset Income Fund, Class I	1.3%
Government National Mortgage Association, TBA, 5.00%, due 04/01/55	1.2%
U.S. Treasury Notes, 3.50%, due 09/30/27	1.1%
Federal Home Loan Mortgage Corp., 4.50%, due 12/01/52	1.1%
Government National Mortgage Association, TBA, 3.50%, due 02/01/52	0.9%
Federal Home Loan Mortgage Corp., 4.00%, due 11/01/52	0.8%

Material Fund Change [Text Block]

Accountant Change Date

Sep. 30, 2025

C000201585

Shareholder Report [Line Items]

Fund Name

TCW MetWest Investment Grade Credit Fund

Class Name

Class I

Trading Symbol

MWIGX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the TCW MetWest Investment Grade Credit Fund for the period of April 1, 2025 to September 30, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.tcw.com/Literature/Fund-Literature. You can also request this information by contacting us at 800-FUND-TCW (800-386-3829).

Additional Information Phone Number

800-FUND-TCW (800-386-3829)

Additional Information Website

TCW MetWest Investment Grade Credit Fund

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Class I	$25	0.49%^{Footnote Reference*}

Footnote	Description
Footnote^*	Annualized.

Expenses Paid, Amount

$ 25

Expense Ratio, Percent

0.49%

^[26]

AssetsNet

$ 27,815,802

Holdings Count | Holding

465

InvestmentCompanyPortfolioTurnover

165.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$27,815,802
# of Portfolio Holdings465
Portfolio Turnover Rate165%

Holdings [Text Block]

Asset Allocation (as a % of Net Assets)

Corporate Bonds	61.8%
Residential Mortgage-Backed Securities - Agency	14.1%
U.S. Treasury Securities	11.3%
Commercial Mortgage-Backed Securities - Non-Agency	8.7%
Residential Mortgage-Backed Securities - Non-Agency	5.5%
Short-Term Investments	5.4%
Asset-Backed Securities	3.6%
Municipal Bonds	2.5%
Other Security Types^{Footnote Reference*}	0.8%
Liabilities in Excess of Other Assets	(13.7%)

Footnote	Description
Footnote^*	Please refer to the Fund’s Semi-Annual Financial Statements which are available on the Fund’s website at www.tcw.com/Literature/Fund-Literature for a complete listing of all categories.

Largest Holdings [Text Block]

Top Ten Holdings (as a % of Net Assets)

U.S. Treasury Notes, 3.50%, due 09/30/27	6.2%
U.S. Treasury Notes, 4.25%, due 08/15/35	3.6%
Uniform Mortgage-Backed Security, TBA, 4.00%, due 02/01/52	1.8%
Federal National Mortgage Association, 4.50%, due 02/01/53	1.5%
Uniform Mortgage-Backed Security, TBA, 3.50%, due 01/01/52	1.5%
Bank of America Corp., 2.30%, due 07/21/32 (1 day USD SOFR + 1.220%)	1.4%
Uniform Mortgage-Backed Security, TBA, 3.00%, due 12/01/51	1.3%
JPMorgan Chase & Co., 1.95%, due 02/04/32 (1 day USD SOFR + 1.065%)	1.2%
Wells Fargo & Co., 3.35%, due 03/02/33 (1 day USD SOFR + 1.500%)	1.0%
U.S. Treasury Notes, 3.63%, due 09/30/30	0.9%

Material Fund Change [Text Block]

Accountant Change Date

Sep. 30, 2025

C000201586

Shareholder Report [Line Items]

Fund Name

TCW MetWest Investment Grade Credit Fund

Class Name

Class M

Trading Symbol

MWISX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the TCW MetWest Investment Grade Credit Fund for the period of April 1, 2025 to September 30, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.tcw.com/Literature/Fund-Literature. You can also request this information by contacting us at 800-FUND-TCW (800-386-3829).

Additional Information Phone Number

800-FUND-TCW (800-386-3829)

Additional Information Website

TCW MetWest Investment Grade Credit Fund

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Class M	$36	0.70%^{Footnote Reference*}

Footnote	Description
Footnote^*	Annualized.

Expenses Paid, Amount

$ 36

Expense Ratio, Percent

0.70%

^[27]

AssetsNet

$ 27,815,802

Holdings Count | Holding

465

InvestmentCompanyPortfolioTurnover

165.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$27,815,802
# of Portfolio Holdings465
Portfolio Turnover Rate165%

Holdings [Text Block]

Asset Allocation (as a % of Net Assets)

Corporate Bonds	61.8%
Residential Mortgage-Backed Securities - Agency	14.1%
U.S. Treasury Securities	11.3%
Commercial Mortgage-Backed Securities - Non-Agency	8.7%
Residential Mortgage-Backed Securities - Non-Agency	5.5%
Short-Term Investments	5.4%
Asset-Backed Securities	3.6%
Municipal Bonds	2.5%
Other Security Types^{Footnote Reference*}	0.8%
Liabilities in Excess of Other Assets	(13.7%)

Footnote	Description
Footnote^*	Please refer to the Fund’s Semi-Annual Financial Statements which are available on the Fund’s website at www.tcw.com/Literature/Fund-Literature for a complete listing of all categories.

Largest Holdings [Text Block]

Top Ten Holdings (as a % of Net Assets)

U.S. Treasury Notes, 3.50%, due 09/30/27	6.2%
U.S. Treasury Notes, 4.25%, due 08/15/35	3.6%
Uniform Mortgage-Backed Security, TBA, 4.00%, due 02/01/52	1.8%
Federal National Mortgage Association, 4.50%, due 02/01/53	1.5%
Uniform Mortgage-Backed Security, TBA, 3.50%, due 01/01/52	1.5%
Bank of America Corp., 2.30%, due 07/21/32 (1 day USD SOFR + 1.220%)	1.4%
Uniform Mortgage-Backed Security, TBA, 3.00%, due 12/01/51	1.3%
JPMorgan Chase & Co., 1.95%, due 02/04/32 (1 day USD SOFR + 1.065%)	1.2%
Wells Fargo & Co., 3.35%, due 03/02/33 (1 day USD SOFR + 1.500%)	1.0%
U.S. Treasury Notes, 3.63%, due 09/30/30	0.9%

Material Fund Change [Text Block]

Accountant Change Date

Sep. 30, 2025

C000228997

Shareholder Report [Line Items]

Fund Name

TCW MetWest Sustainable Securitized Fund

Class Name

Class I

Trading Symbol

MWESX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the TCW MetWest Sustainable Securitized Fund for the period of April 1, 2025 to September 30, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.tcw.com/Literature/Fund-Literature. You can also request this information by contacting us at 800-FUND-TCW (800-386-3829).

Additional Information Phone Number

800-FUND-TCW (800-386-3829)

Additional Information Website

TCW MetWest Sustainable Securitized Fund

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Class I	$25	0.49%^{Footnote Reference*}

Footnote	Description
Footnote^*	Annualized.

Expenses Paid, Amount

$ 25

Expense Ratio, Percent

0.49%

^[28]

AssetsNet

$ 21,427,645

Holdings Count | Holding

222

InvestmentCompanyPortfolioTurnover

181.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$21,427,645
# of Portfolio Holdings222
Portfolio Turnover Rate181%

Holdings [Text Block]

Asset Allocation (as a % of Net Assets)

Residential Mortgage-Backed Securities - Agency	39.8%
Commercial Mortgage-Backed Securities - Non-Agency	28.0%
Asset-Backed Securities	17.1%
U.S. Treasury Securities	14.7%
Residential Mortgage-Backed Securities - Non-Agency	11.0%
Short-Term Investments	6.3%
Commercial Mortgage-Backed Securities - Agency	1.1%
Liabilities in Excess of Other Assets	(18.0%)

Largest Holdings [Text Block]

Top Ten Holdings (as a % of Net Assets)

U.S. Treasury Notes, 4.25%, due 08/15/35	6.5%
U.S. Treasury Notes, 3.63%, due 09/30/30	4.4%
U.S. Treasury Notes, 3.50%, due 09/30/27	3.7%
Government National Mortgage Association, TBA, 5.50%, due 04/01/55	3.4%
Government National Mortgage Association, TBA, 5.00%, due 04/01/55	3.2%
Government National Mortgage Association, TBA, 3.50%, due 02/01/52	2.8%
Government National Mortgage Association, TBA, 4.00%, due 05/01/52	2.4%
Government National Mortgage Association, TBA, 2.50%, due 12/01/51	1.9%
Government National Mortgage Association, TBA, 4.50%, due 08/01/54	1.8%
Uniform Mortgage-Backed Security, TBA, 4.00%, due 02/01/52	1.0%

Material Fund Change [Text Block]

Accountant Change Date

Sep. 30, 2025

C000228996

Shareholder Report [Line Items]

Fund Name

TCW MetWest Sustainable Securitized Fund

Class Name

Class M

Trading Symbol

MWERX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the TCW MetWest Sustainable Securitized Fund for the period of April 1, 2025 to September 30, 2025.

Shareholder Report Annual or Semi-Annual

Semi-Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Fund at www.tcw.com/Literature/Fund-Literature. You can also request this information by contacting us at 800-FUND-TCW (800-386-3829).

Additional Information Phone Number

800-FUND-TCW (800-386-3829)

Additional Information Website

TCW MetWest Sustainable Securitized Fund

Expenses [Text Block]

What were the Fund costs for the last six months?

(based on a hypothetical $10,000 investment)

Class Name	Cost of a $10,000 investment	Cost paid as a percentage of a $10,000 investment
Class M	$36	0.70%^{Footnote Reference*}

Footnote	Description
Footnote^*	Annualized.

Expenses Paid, Amount

$ 36

Expense Ratio, Percent

0.70%

^[29]

AssetsNet

$ 21,427,645

Holdings Count | Holding

222

InvestmentCompanyPortfolioTurnover

181.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$21,427,645
# of Portfolio Holdings222
Portfolio Turnover Rate181%

Holdings [Text Block]

Asset Allocation (as a % of Net Assets)

Residential Mortgage-Backed Securities - Agency	39.8%
Commercial Mortgage-Backed Securities - Non-Agency	28.0%
Asset-Backed Securities	17.1%
U.S. Treasury Securities	14.7%
Residential Mortgage-Backed Securities - Non-Agency	11.0%
Short-Term Investments	6.3%
Commercial Mortgage-Backed Securities - Agency	1.1%
Liabilities in Excess of Other Assets	(18.0%)

Largest Holdings [Text Block]

Top Ten Holdings (as a % of Net Assets)

U.S. Treasury Notes, 4.25%, due 08/15/35	6.5%
U.S. Treasury Notes, 3.63%, due 09/30/30	4.4%
U.S. Treasury Notes, 3.50%, due 09/30/27	3.7%
Government National Mortgage Association, TBA, 5.50%, due 04/01/55	3.4%
Government National Mortgage Association, TBA, 5.00%, due 04/01/55	3.2%
Government National Mortgage Association, TBA, 3.50%, due 02/01/52	2.8%
Government National Mortgage Association, TBA, 4.00%, due 05/01/52	2.4%
Government National Mortgage Association, TBA, 2.50%, due 12/01/51	1.9%
Government National Mortgage Association, TBA, 4.50%, due 08/01/54	1.8%
Uniform Mortgage-Backed Security, TBA, 4.00%, due 02/01/52	1.0%

Material Fund Change [Text Block]

Accountant Change Date

Sep. 30, 2025

[1]	Annualized.
[2]	Annualized.
[3]	Annualized.
[4]	The dollar amounts above reflect expenses paid since the commencement of operations. Expenses for the full reporting period would be higher.
[5]	Annualized.
[6]	Annualized.
[7]	Annualized.
[8]	Annualized.
[9]	Annualized.
[10]	Annualized.
[11]	The dollar amounts above reflect expenses paid since the commencement of operations. Expenses for the full reporting period would be higher.
[12]	Annualized.
[13]	Annualized.
[14]	Annualized.
[15]	The dollar amounts above reflect expenses paid since the commencement of operations. Expenses for the full reporting period would be higher.
[16]	Annualized.
[17]	Annualized.
[18]	Annualized.
[19]	Annualized.
[20]	Annualized.
[21]	Annualized.
[22]	Annualized.
[23]	Annualized.
[24]	The dollar amounts above reflect expenses paid since the commencement of operations. Expenses for the full reporting period would be higher.
[25]	Annualized.
[26]	Annualized.
[27]	Annualized.
[28]	Annualized.
[29]	Annualized.