This semi-annual shareholder report contains important information about the TCW MetWest AlphaTrak 500 Fund for the six-month period ended September 30, 2024.

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).

Material Fund Change Notice [Text Block]

This report contains material fund changes that occurred during the period ended September 30, 2024.

Additional Information Phone Number

800-386-3829

Additional Information Website

www.tcw.com/Literature/Fund-Literature

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	$24	0.45%

Expenses Paid, Amount

$ 24

Expense Ratio, Percent

0.45%

AssetsNet

$ 30,450,451

Holdings Count | Holding

159

InvestmentCompanyPortfolioTurnover

160.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$30,450,451
# of Portfolio Holdings159
Portfolio Turnover Rate160%

Holdings [Text Block]

Short-Term Investments	32.64%
Mortgage-Backed	27.51%
Corporates	26.17%
Mutual Funds	12.67%
U.S. Treasury Securities	7.37%
Asset-Backed Securities	6.14%
Municipal Bonds	0.76%
Common Stock	0.08%
Liabilities in Excess of Other Assets	(13.34)%

Largest Holdings [Text Block]

UMBS (TBA)	19.29%
iShares Core S&P 500 ETF	12.67%
U.S. Treasury Notes (WI)	7.37%
Ginnie Mae	1.95%
Fannie Mae REMICS	1.94%
Ginnie Mae (TBA)	1.89%
Bank of America Corp.	1.75%
JPMorgan Chase & Co.	1.65%
Wells Fargo & Co.	1.47%
Morgan Stanley	1.25%

Material Fund Change [Text Block]

Material Fund Changes

The Metropolitan West AlphaTrak 500 Fund was renamed to the TCW MetWest AlphaTrak 500 Fund on July 29, 2024. On October 30, 2024, the TCW MetWest AlphaTrak 500 Fund was closed.

Updated Prospectus Phone Number

800-386-3829

Updated Prospectus Web Address

<span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: justify;">www.tcw.com/Literature/Fund-Literature</span>

C000201587

Shareholder Report [Line Items]

Fund Name

TCW MetWest Corporate Bond Fund

Class Name

Class I

Trading Symbol

MWCBX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the TCW MetWest Corporate Bond Fund for the six-month period ended September 30, 2024.

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).

Material Fund Change Notice [Text Block]

This report contains material fund changes that occurred during the period ended September 30, 2024.

Additional Information Phone Number

800-386-3829

Additional Information Website

www.tcw.com/Literature/Fund-Literature

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	$26	0.50%

Expenses Paid, Amount

$ 26

Expense Ratio, Percent

0.50%

AssetsNet

$ 4,974,021

Holdings Count | Holding

257

InvestmentCompanyPortfolioTurnover

46.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$4,974,021
# of Portfolio Holdings257
Portfolio Turnover Rate46%

Holdings [Text Block]

Corporates	83.02%
U.S. Treasury Securities	9.39%
Short-Term Investments	2.97%
Municipal Bonds	2.55%
Asset-Backed Securities	0.67%
Mortgage-Backed	0.64%
Liabilities in Excess of Other Assets	0.76%

Largest Holdings [Text Block]

U.S. Treasury Bonds (WI)	7.33%
Bank of America Corp.	3.03%
Wells Fargo & Co.	2.36%
JPMorgan Chase & Co.	2.23%
Morgan Stanley	2.08%
U.S. Treasury Notes	1.98%
Goldman Sachs Group, Inc. (The)	1.91%
Citigroup, Inc.	1.62%
T-Mobile USA, Inc.	1.49%
HSBC Holdings PLC	1.42%

Material Fund Change [Text Block]

Material Fund Changes

The Metropolitan West Corporate Bond Fund was renamed to the TCW MetWest Corporate Bond Fund on July 29, 2024. On November 18, 2024, the TCW MetWest Corporate Bond Fund was reorganized into the TCW Corporate Bond ETF, a new series of the TCW ETF Trust, as previously announced.

Updated Prospectus Phone Number

800-386-3829

Updated Prospectus Web Address

C000201588

Shareholder Report [Line Items]

Fund Name

TCW MetWest Corporate Bond Fund

Class Name

Class M

Trading Symbol

MWCSX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the TCW MetWest Corporate Bond Fund for the six-month period ended September 30, 2024.

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).

Material Fund Change Notice [Text Block]

This report contains material fund changes that occurred during the period ended September 30, 2024.

Additional Information Phone Number

800-386-3829

Additional Information Website

www.tcw.com/Literature/Fund-Literature

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	$39	0.75%

Expenses Paid, Amount

$ 39

Expense Ratio, Percent

0.75%

AssetsNet

$ 4,974,021

Holdings Count | Holding

257

InvestmentCompanyPortfolioTurnover

46.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$4,974,021
# of Portfolio Holdings257
Portfolio Turnover Rate46%

Holdings [Text Block]

Corporates	83.02%
U.S. Treasury Securities	9.39%
Short-Term Investments	2.97%
Municipal Bonds	2.55%
Asset-Backed Securities	0.67%
Mortgage-Backed	0.64%
Liabilities in Excess of Other Assets	0.76%

Largest Holdings [Text Block]

U.S. Treasury Bonds (WI)	7.33%
Bank of America Corp.	3.03%
Wells Fargo & Co.	2.36%
JPMorgan Chase & Co.	2.23%
Morgan Stanley	2.08%
U.S. Treasury Notes	1.98%
Goldman Sachs Group, Inc. (The)	1.91%
Citigroup, Inc.	1.62%
T-Mobile USA, Inc.	1.49%
HSBC Holdings PLC	1.42%

Material Fund Change [Text Block]

Material Fund Changes

Updated Prospectus Phone Number

800-386-3829

Updated Prospectus Web Address

C000127913

Shareholder Report [Line Items]

Fund Name

TCW MetWest Floating Rate Income Fund

Class Name

Class I

Trading Symbol

MWFLX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the TCW MetWest Floating Rate Income Fund for the six-month period ended September 30, 2024.

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).

Material Fund Change Notice [Text Block]

This report contains material fund changes that occurred during the period ended September 30, 2024.

Additional Information Phone Number

800-386-3829

Additional Information Website

www.tcw.com/Literature/Fund-Literature

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	$36	0.70%

Expenses Paid, Amount

$ 36

Expense Ratio, Percent

0.70%

AssetsNet

$ 295,394,644

Holdings Count | Holding

358

InvestmentCompanyPortfolioTurnover

52.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$295,394,644
# of Portfolio Holdings358
Portfolio Turnover Rate52%

Holdings [Text Block]

Bank Loans	89.92%
Short-Term Investments	12.49%
Corporates	3.42%
Asset-Backed Securities	0.99%
U.S. Treasury Securities	0.49%
Preferred Stock	0.12%
Common Stock	0.10%
Liabilities in Excess of Other Assets	(7.53)%

Largest Holdings [Text Block]

Alpha Generation LLC	0.98%
EagleView Technology Co.	0.85%
Magnite, Inc.	0.83%
Asurion LLC	0.77%
Osmosis Buyer Ltd.	0.77%
Catalent Pharma Solutions, Inc.	0.68%
Xerox Corp.	0.65%
Vantage Elevator Solutions	0.64%
Parexel International, Inc.	0.63%
Element Materials Technology Group U.S. Holdings, Inc.	0.62%

Material Fund Change [Text Block]

Material Fund Changes

The Metropolitan West Floating Rate Income Fund was renamed to the TCW MetWest Floating Rate Income Fund on July 29, 2024. On November 18, 2024, the TCW MetWest Floating Rate Income Fund was reorganized into the TCW Senior Loan ETF, a new series of the TCW ETF Trust, as previously announced.

Updated Prospectus Phone Number

800-386-3829

Updated Prospectus Web Address

C000127912

Shareholder Report [Line Items]

Fund Name

TCW MetWest Floating Rate Income Fund

Class Name

Class M

Trading Symbol

MWFRX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the TCW MetWest Floating Rate Income Fund for the six-month period ended September 30, 2024.

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).

Material Fund Change Notice [Text Block]

This report contains material fund changes that occurred during the period ended September 30, 2024.

Additional Information Phone Number

800-386-3829

Additional Information Website

www.tcw.com/Literature/Fund-Literature

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	$46	0.90%

Expenses Paid, Amount

$ 46

Expense Ratio, Percent

0.90%

AssetsNet

$ 295,394,644

Holdings Count | Holding

358

InvestmentCompanyPortfolioTurnover

52.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$295,394,644
# of Portfolio Holdings358
Portfolio Turnover Rate52%

Holdings [Text Block]

Bank Loans	89.92%
Short-Term Investments	12.49%
Corporates	3.42%
Asset-Backed Securities	0.99%
U.S. Treasury Securities	0.49%
Preferred Stock	0.12%
Common Stock	0.10%
Liabilities in Excess of Other Assets	(7.53)%

Largest Holdings [Text Block]

Alpha Generation LLC	0.98%
EagleView Technology Co.	0.85%
Magnite, Inc.	0.83%
Asurion LLC	0.77%
Osmosis Buyer Ltd.	0.77%
Catalent Pharma Solutions, Inc.	0.68%
Xerox Corp.	0.65%
Vantage Elevator Solutions	0.64%
Parexel International, Inc.	0.63%
Element Materials Technology Group U.S. Holdings, Inc.	0.62%

Material Fund Change [Text Block]

Material Fund Changes

Updated Prospectus Phone Number

800-386-3829

Updated Prospectus Web Address

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 six-month period ended September 30, 2024.

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).

Material Fund Change Notice [Text Block]

This report contains material fund changes that occurred during the period ended September 30, 2024.

Additional Information Phone Number

800-386-3829

Additional Information Website

www.tcw.com/Literature/Fund-Literature

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%

Expenses Paid, Amount

$ 31

Expense Ratio, Percent

0.60%

AssetsNet

$ 470,649,106

Holdings Count | Holding

299

InvestmentCompanyPortfolioTurnover

31.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$470,649,106
# of Portfolio Holdings299
Portfolio Turnover Rate31%

Holdings [Text Block]

Corporates	73.64%
Bank Loans	17.10%
Short-Term Investments	10.93%
Common Stock	0.51%
Liabilities in Excess of Other Assets	(2.18)%

Largest Holdings [Text Block]

CCO Holdings LLC/CCO Holdings Capital Corp.	2.72%
Tenet Healthcare Corp.	2.60%
Centene Corp.	2.56%
Post Holdings, Inc.	1.80%
Ford Motor Credit Co. LLC	1.74%
TransDigm, Inc.	1.64%
CSC Holdings LLC	1.37%
Frontier Communications Holdings LLC	1.31%
GLP Capital LP/GLP Financing II, Inc.	1.31%
Ferrellgas LP/Ferrellgas Finance Corp.	1.22%

Material Fund Change [Text Block]

Material Fund Changes

The Metropolitan West High Yield Bond Fund was renamed to the TCW MetWest High Yield Bond Fund on July 29, 2024.

Updated Prospectus Phone Number

800-386-3829

Updated Prospectus Web Address

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 six-month period ended September 30, 2024.

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).

Material Fund Change Notice [Text Block]

This report contains material fund changes that occurred during the period ended September 30, 2024.

Additional Information Phone Number

800-386-3829

Additional Information Website

www.tcw.com/Literature/Fund-Literature

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%

Expenses Paid, Amount

$ 44

Expense Ratio, Percent

0.85%

AssetsNet

$ 470,649,106

Holdings Count | Holding

299

InvestmentCompanyPortfolioTurnover

31.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$470,649,106
# of Portfolio Holdings299
Portfolio Turnover Rate31%

Holdings [Text Block]

Corporates	73.64%
Bank Loans	17.10%
Short-Term Investments	10.93%
Common Stock	0.51%
Liabilities in Excess of Other Assets	(2.18)%

Largest Holdings [Text Block]

CCO Holdings LLC/CCO Holdings Capital Corp.	2.72%
Tenet Healthcare Corp.	2.60%
Centene Corp.	2.56%
Post Holdings, Inc.	1.80%
Ford Motor Credit Co. LLC	1.74%
TransDigm, Inc.	1.64%
CSC Holdings LLC	1.37%
Frontier Communications Holdings LLC	1.31%
GLP Capital LP/GLP Financing II, Inc.	1.31%
Ferrellgas LP/Ferrellgas Finance Corp.	1.22%

Material Fund Change [Text Block]

Material Fund Changes

The Metropolitan West High Yield Bond Fund was renamed to the TCW MetWest High Yield Bond Fund on July 29, 2024.

Updated Prospectus Phone Number

800-386-3829

Updated Prospectus Web Address

C000003070

Shareholder Report [Line Items]

Fund Name

TCW MetWest Intermediate Bond Fund

Class Name

Class I

Trading Symbol

MWIIX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the TCW MetWest Intermediate Bond Fund for the six-month period ended September 30, 2024.

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).

Material Fund Change Notice [Text Block]

This report contains material fund changes that occurred during the period ended September 30, 2024.

Additional Information Phone Number

800-386-3829

Additional Information Website

www.tcw.com/Literature/Fund-Literature

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	0.48%

Expenses Paid, Amount

$ 25

Expense Ratio, Percent

0.48%

AssetsNet

$ 886,917,579

Holdings Count | Holding

544

InvestmentCompanyPortfolioTurnover

327.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$886,917,579
# of Portfolio Holdings544
Portfolio Turnover Rate327%

Holdings [Text Block]

U.S. Treasury Securities	54.09%
Mortgage-Backed	26.06%
Corporates	20.74%
Asset-Backed Securities	5.99%
Short-Term Investments	4.38%
Municipal Bonds	0.85%
Bank Loans	0.84%
Common Stock	0.06%
Liabilities in Excess of Other Assets	(13.01)%

Largest Holdings [Text Block]

U.S. Treasury Notes (WI)	37.24%
U.S. Treasury Notes	16.86%
UMBS (TBA)	7.84%
Ginnie Mae (TBA)	3.28%
JPMorgan Chase & Co.	1.05%
Fannie Mae Pool MA4733	0.94%
Bank of America Corp.	0.78%
Wells Fargo & Co.	0.74%
PRPM LLC	0.67%
WarnerMedia Holdings, Inc.	0.63%

Material Fund Change [Text Block]

Material Fund Changes

The Metropolitan West Intermediate Bond Fund was renamed to the TCW MetWest Intermediate Bond Fund on July 29, 2024.

Updated Prospectus Phone Number

800-386-3829

Updated Prospectus Web Address

C000003071

Shareholder Report [Line Items]

Fund Name

TCW MetWest Intermediate Bond Fund

Class Name

Class M

Trading Symbol

MWIMX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about the TCW MetWest Intermediate Bond Fund for the six-month period ended September 30, 2024.

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).

Material Fund Change Notice [Text Block]

This report contains material fund changes that occurred during the period ended September 30, 2024.

Additional Information Phone Number

800-386-3829

Additional Information Website

www.tcw.com/Literature/Fund-Literature

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%

Expenses Paid, Amount

$ 36

Expense Ratio, Percent

0.70%

AssetsNet

$ 886,917,579

Holdings Count | Holding

544

InvestmentCompanyPortfolioTurnover

327.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$886,917,579
# of Portfolio Holdings544
Portfolio Turnover Rate327%

Holdings [Text Block]

U.S. Treasury Securities	54.09%
Mortgage-Backed	26.06%
Corporates	20.74%
Asset-Backed Securities	5.99%
Short-Term Investments	4.38%
Municipal Bonds	0.85%
Bank Loans	0.84%
Common Stock	0.06%
Liabilities in Excess of Other Assets	(13.01)%

Largest Holdings [Text Block]

U.S. Treasury Notes (WI)	37.24%
U.S. Treasury Notes	16.86%
UMBS (TBA)	7.84%
Ginnie Mae (TBA)	3.28%
JPMorgan Chase & Co.	1.05%
Fannie Mae Pool MA4733	0.94%
Bank of America Corp.	0.78%
Wells Fargo & Co.	0.74%
PRPM LLC	0.67%
WarnerMedia Holdings, Inc.	0.63%

Material Fund Change [Text Block]

Material Fund Changes

The Metropolitan West Intermediate Bond Fund was renamed to the TCW MetWest Intermediate Bond Fund on July 29, 2024.

Updated Prospectus Phone Number

800-386-3829

Updated Prospectus Web Address

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 six-month period ended September 30, 2024.

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).

Material Fund Change Notice [Text Block]

This report contains material fund changes that occurred during the period ended September 30, 2024.

Additional Information Phone Number

800-386-3829

Additional Information Website

www.tcw.com/Literature/Fund-Literature

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%

Expenses Paid, Amount

$ 25

Expense Ratio, Percent

0.49%

AssetsNet

$ 27,827,390

Holdings Count | Holding

417

InvestmentCompanyPortfolioTurnover

228.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$27,827,390
# of Portfolio Holdings417
Portfolio Turnover Rate228%

Holdings [Text Block]

Corporates	51.20%
Mortgage-Backed	30.22%
U.S. Treasury Securities	24.95%
Asset-Backed Securities	4.04%
Municipal Bonds	1.65%
Short-Term Investments	1.55%
Liabilities in Excess of Other Assets	(13.61)%

Largest Holdings [Text Block]

U.S. Treasury Notes	12.89%
U.S. Treasury Notes (WI)	12.07%
UMBS (TBA)	10.60%
Ginnie Mae (TBA)	3.17%
JPMorgan Chase & Co.	2.27%
Bank of America Corp.	2.06%
Morgan Stanley	1.39%
Wells Fargo & Co.	1.26%
Citigroup, Inc.	1.03%
Goldman Sachs Group, Inc. (The)	0.84%

Material Fund Change [Text Block]

Material Fund Changes

The Metropolitan West Investment Grade Credit Fund was renamed to the TCW MetWest Investment Grade Credit Fund on July 29, 2024.

Updated Prospectus Phone Number

800-386-3829

Updated Prospectus Web Address

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 six-month period ended September 30, 2024.

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).

Material Fund Change Notice [Text Block]

This report contains material fund changes that occurred during the period ended September 30, 2024.

Additional Information Phone Number

800-386-3829

Additional Information Website

www.tcw.com/Literature/Fund-Literature

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%

Expenses Paid, Amount

$ 36

Expense Ratio, Percent

0.70%

AssetsNet

$ 27,827,390

Holdings Count | Holding

417

InvestmentCompanyPortfolioTurnover

228.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$27,827,390
# of Portfolio Holdings417
Portfolio Turnover Rate228%

Holdings [Text Block]

Corporates	51.20%
Mortgage-Backed	30.22%
U.S. Treasury Securities	24.95%
Asset-Backed Securities	4.04%
Municipal Bonds	1.65%
Short-Term Investments	1.55%
Liabilities in Excess of Other Assets	(13.61)%

Largest Holdings [Text Block]

U.S. Treasury Notes	12.89%
U.S. Treasury Notes (WI)	12.07%
UMBS (TBA)	10.60%
Ginnie Mae (TBA)	3.17%
JPMorgan Chase & Co.	2.27%
Bank of America Corp.	2.06%
Morgan Stanley	1.39%
Wells Fargo & Co.	1.26%
Citigroup, Inc.	1.03%
Goldman Sachs Group, Inc. (The)	0.84%

Material Fund Change [Text Block]

Material Fund Changes

The Metropolitan West Investment Grade Credit Fund was renamed to the TCW MetWest Investment Grade Credit Fund on July 29, 2024.

Updated Prospectus Phone Number

800-386-3829

Updated Prospectus Web Address

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 six-month period ended September 30, 2024.

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).

Material Fund Change Notice [Text Block]

This report contains material fund changes that occurred during the period ended September 30, 2024.

Additional Information Phone Number

800-386-3829

Additional Information Website

www.tcw.com/Literature/Fund-Literature

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	$36	0.71%

Expenses Paid, Amount

$ 36

Expense Ratio, Percent

0.71%

AssetsNet

$ 1,058,291,219

Holdings Count | Holding

424

InvestmentCompanyPortfolioTurnover

214.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$1,058,291,219
# of Portfolio Holdings424
Portfolio Turnover Rate214%

Holdings [Text Block]

Mortgage-Backed	57.01%
Corporates	27.75%
U.S. Treasury Securities	12.44%
Short-Term Investments	12.34%
Asset-Backed Securities	8.46%
Bank Loans	1.25%
Municipal Bonds	1.14%
Liabilities in Excess of Other Assets	(20.39)%

Largest Holdings [Text Block]

UMBS (TBA)	16.54%
U.S. Treasury Notes (WI)	8.32%
Ginnie Mae	4.89%
U.S. Treasury Notes	4.12%
Ginnie Mae (TBA)	3.99%
Fannie Mae REMICS	2.56%
PRPM LLC	1.79%
JPMorgan Mortgage Acquisition Trust	1.69%
JPMorgan Chase & Co.	1.57%
BX Commercial Mortgage Trust	1.45%

Material Fund Change [Text Block]

Material Fund Changes

The Metropolitan West Low Duration Bond Fund was renamed to the TCW MetWest Low Duration Bond Fund on July 29, 2024.

Updated Prospectus Phone Number

800-386-3829

Updated Prospectus Web Address

C000003063

Shareholder Report [Line Items]

Fund Name

TCW MetWest Low Duration Bond Fund

Class Name

Class I

Trading Symbol

MWLIX

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 six-month period ended September 30, 2024.

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).

Material Fund Change Notice [Text Block]

This report contains material fund changes that occurred during the period ended September 30, 2024.

Additional Information Phone Number

800-386-3829

Additional Information Website

www.tcw.com/Literature/Fund-Literature

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	0.44%

Expenses Paid, Amount

$ 23

Expense Ratio, Percent

0.44%

AssetsNet

$ 1,058,291,219

Holdings Count | Holding

424

InvestmentCompanyPortfolioTurnover

214.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$1,058,291,219
# of Portfolio Holdings424
Portfolio Turnover Rate214%

Holdings [Text Block]

Mortgage-Backed	57.01%
Corporates	27.75%
U.S. Treasury Securities	12.44%
Short-Term Investments	12.34%
Asset-Backed Securities	8.46%
Bank Loans	1.25%
Municipal Bonds	1.14%
Liabilities in Excess of Other Assets	(20.39)%

Largest Holdings [Text Block]

UMBS (TBA)	16.54%
U.S. Treasury Notes (WI)	8.32%
Ginnie Mae	4.89%
U.S. Treasury Notes	4.12%
Ginnie Mae (TBA)	3.99%
Fannie Mae REMICS	2.56%
PRPM LLC	1.79%
JPMorgan Mortgage Acquisition Trust	1.69%
JPMorgan Chase & Co.	1.57%
BX Commercial Mortgage Trust	1.45%

Material Fund Change [Text Block]

Material Fund Changes

The Metropolitan West Low Duration Bond Fund was renamed to the TCW MetWest Low Duration Bond Fund on July 29, 2024.

Updated Prospectus Phone Number

800-386-3829

Updated Prospectus Web Address

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 six-month period ended September 30, 2024.

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).

Material Fund Change Notice [Text Block]

This report contains material fund changes that occurred during the period ended September 30, 2024.

Additional Information Phone Number

800-386-3829

Additional Information Website

www.tcw.com/Literature/Fund-Literature

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%

Expenses Paid, Amount

$ 32

Expense Ratio, Percent

0.63%

AssetsNet

$ 1,058,291,219

Holdings Count | Holding

424

InvestmentCompanyPortfolioTurnover

214.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$1,058,291,219
# of Portfolio Holdings424
Portfolio Turnover Rate214%

Holdings [Text Block]

Mortgage-Backed	57.01%
Corporates	27.75%
U.S. Treasury Securities	12.44%
Short-Term Investments	12.34%
Asset-Backed Securities	8.46%
Bank Loans	1.25%
Municipal Bonds	1.14%
Liabilities in Excess of Other Assets	(20.39)%

Largest Holdings [Text Block]

UMBS (TBA)	16.54%
U.S. Treasury Notes (WI)	8.32%
Ginnie Mae	4.89%
U.S. Treasury Notes	4.12%
Ginnie Mae (TBA)	3.99%
Fannie Mae REMICS	2.56%
PRPM LLC	1.79%
JPMorgan Mortgage Acquisition Trust	1.69%
JPMorgan Chase & Co.	1.57%
BX Commercial Mortgage Trust	1.45%

Material Fund Change [Text Block]

Material Fund Changes

The Metropolitan West Low Duration Bond Fund was renamed to the TCW MetWest Low Duration Bond Fund on July 29, 2024.

Updated Prospectus Phone Number

800-386-3829

Updated Prospectus Web Address

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 six-month period ended September 30, 2024.

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).

Material Fund Change Notice [Text Block]

This report contains material fund changes that occurred during the period ended September 30, 2024.

Additional Information Phone Number

800-386-3829

Additional Information Website

www.tcw.com/Literature/Fund-Literature

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%

Expenses Paid, Amount

$ 41

Expense Ratio, Percent

0.80%

AssetsNet

$ 68,904,167

Holdings Count | Holding

528

InvestmentCompanyPortfolioTurnover

109.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$68,904,167
# of Portfolio Holdings528
Portfolio Turnover Rate109%

Holdings [Text Block]

Mortgage-Backed	52.37%
Corporates	23.71%
Short-Term Investments	18.49%
Asset-Backed Securities	15.92%
Municipal Bonds	0.15%
Common Stock	0.11%
Liabilities in Excess of Other Assets	(10.75)%

Largest Holdings [Text Block]

UMBS (TBA)	5.51%
Ginnie Mae (TBA)	3.73%
CIM Trust	2.37%
SLM Student Loan Trust	2.19%
GSAA Home Equity Trust	2.09%
FirstKey Homes Trust	1.45%
Progress Residential	1.44%
JPMorgan Chase & Co.	1.43%
Bank of America Corp.	1.32%
First Franklin Mortgage Loan Trust	1.22%

Material Fund Change [Text Block]

Material Fund Changes

The Metropolitan West Strategic Income Fund was renamed to the TCW MetWest Strategic Income Fund on July 29, 2024.

Updated Prospectus Phone Number

800-386-3829

Updated Prospectus Web Address

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 six-month period ended September 30, 2024.

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).

Material Fund Change Notice [Text Block]

This report contains material fund changes that occurred during the period ended September 30, 2024.

Additional Information Phone Number

800-386-3829

Additional Information Website

www.tcw.com/Literature/Fund-Literature

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%

Expenses Paid, Amount

$ 53

Expense Ratio, Percent

1.04%

AssetsNet

$ 68,904,167

Holdings Count | Holding

528

InvestmentCompanyPortfolioTurnover

109.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$68,904,167
# of Portfolio Holdings528
Portfolio Turnover Rate109%

Holdings [Text Block]

Mortgage-Backed	52.37%
Corporates	23.71%
Short-Term Investments	18.49%
Asset-Backed Securities	15.92%
Municipal Bonds	0.15%
Common Stock	0.11%
Liabilities in Excess of Other Assets	(10.75)%

Largest Holdings [Text Block]

UMBS (TBA)	5.51%
Ginnie Mae (TBA)	3.73%
CIM Trust	2.37%
SLM Student Loan Trust	2.19%
GSAA Home Equity Trust	2.09%
FirstKey Homes Trust	1.45%
Progress Residential	1.44%
JPMorgan Chase & Co.	1.43%
Bank of America Corp.	1.32%
First Franklin Mortgage Loan Trust	1.22%

Material Fund Change [Text Block]

Material Fund Changes

The Metropolitan West Strategic Income Fund was renamed to the TCW MetWest Strategic Income Fund on July 29, 2024.

Updated Prospectus Phone Number

800-386-3829

Updated Prospectus Web Address

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 six-month period ended September 30, 2024.

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).

Material Fund Change Notice [Text Block]

This report contains material fund changes that occurred during the period ended September 30, 2024.

Additional Information Phone Number

800-386-3829

Additional Information Website

www.tcw.com/Literature/Fund-Literature

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	$26	0.49%

Expenses Paid, Amount

$ 26

Expense Ratio, Percent

0.49%

AssetsNet

$ 11,929,880

Holdings Count | Holding

158

InvestmentCompanyPortfolioTurnover

182.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$11,929,880
# of Portfolio Holdings158
Portfolio Turnover Rate182%

Holdings [Text Block]

Mortgage-Backed	76.83%
Asset-Backed Securities	20.59%
U.S. Treasury Securities	8.56%
Short-Term Investments	4.09%
Liabilities in Excess of Other Assets	(10.07)%

Largest Holdings [Text Block]

Ginnie Mae	7.42%
UMBS (TBA)	5.52%
U.S. Treasury Bonds (WI)	4.15%
Ginnie Mae (TBA)	3.81%
U.S. Treasury Notes	3.66%
Credit Suisse Mortgage Capital Trust	2.47%
BX Trust	2.15%
MHC Trust	1.93%
Commercial Mortgage Trust	1.79%
GoodLeap Sustainable Home Solutions Trust	1.62%

Material Fund Change [Text Block]

Material Fund Changes

The Metropolitan West Sustainable Securitized Fund was renamed to the TCW MetWest Sustainable Securitized Fund on July 29, 2024.

Updated Prospectus Phone Number

800-386-3829

Updated Prospectus Web Address

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 six-month period ended September 30, 2024.

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).

Material Fund Change Notice [Text Block]

This report contains material fund changes that occurred during the period ended September 30, 2024.

Additional Information Phone Number

800-386-3829

Additional Information Website

www.tcw.com/Literature/Fund-Literature

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	$37	0.70%

Expenses Paid, Amount

$ 37

Expense Ratio, Percent

0.70%

AssetsNet

$ 11,929,880

Holdings Count | Holding

158

InvestmentCompanyPortfolioTurnover

182.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$11,929,880
# of Portfolio Holdings158
Portfolio Turnover Rate182%

Holdings [Text Block]

Mortgage-Backed	76.83%
Asset-Backed Securities	20.59%
U.S. Treasury Securities	8.56%
Short-Term Investments	4.09%
Liabilities in Excess of Other Assets	(10.07)%

Largest Holdings [Text Block]

Ginnie Mae	7.42%
UMBS (TBA)	5.52%
U.S. Treasury Bonds (WI)	4.15%
Ginnie Mae (TBA)	3.81%
U.S. Treasury Notes	3.66%
Credit Suisse Mortgage Capital Trust	2.47%
BX Trust	2.15%
MHC Trust	1.93%
Commercial Mortgage Trust	1.79%
GoodLeap Sustainable Home Solutions Trust	1.62%

Material Fund Change [Text Block]

Material Fund Changes

The Metropolitan West Sustainable Securitized Fund was renamed to the TCW MetWest Sustainable Securitized Fund on July 29, 2024.

Updated Prospectus Phone Number

800-386-3829

Updated Prospectus Web Address

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 six-month period ended September 30, 2024.

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).

Material Fund Change Notice [Text Block]

This report contains material fund changes that occurred during the period ended September 30, 2024.

Additional Information Phone Number

800-386-3829

Additional Information Website

www.tcw.com/Literature/Fund-Literature

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	0.78%

Expenses Paid, Amount

$ 40

Expense Ratio, Percent

0.78%

AssetsNet

$ 43,135,561,029

Holdings Count | Holding

1,608

InvestmentCompanyPortfolioTurnover

223.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$43,135,561,029
# of Portfolio Holdings1,608
Portfolio Turnover Rate223%

Holdings [Text Block]

Mortgage-Backed	54.47%
U.S. Treasury Securities	29.59%
Corporates	17.04%
Asset-Backed Securities	5.34%
Short-Term Investments	4.26%
Bank Loans	1.43%
Foreign Government Obligations	0.65%
Municipal Bonds	0.41%
Common Stock	0.18%
Liabilities in Excess of Other Assets	(13.37)%

Largest Holdings [Text Block]

U.S. Treasury Notes (WI)	10.06%
U.S. Treasury Bonds (WI)	9.64%
U.S. Treasury Notes	9.13%
UMBS (TBA)	7.66%
Ginnie Mae (TBA)	4.99%
CIM Trust	4.11%
Ginnie Mae	1.14%
Fannie Mae Pool MA4626	1.07%
Credit Suisse Mortgage Capital Trust	1.06%
Bank of America Corp.	0.82%

Material Fund Change [Text Block]

Material Fund Changes

The Metropolitan West Total Return Bond Fund was renamed to the TCW MetWest Total Return Bond Fund on July 29, 2024.

Updated Prospectus Phone Number

800-386-3829

Updated Prospectus Web Address

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 six-month period ended September 30, 2024.

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).

Material Fund Change Notice [Text Block]

This report contains material fund changes that occurred during the period ended September 30, 2024.

Additional Information Phone Number

800-386-3829

Additional Information Website

www.tcw.com/Literature/Fund-Literature

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	0.45%

Expenses Paid, Amount

$ 23

Expense Ratio, Percent

0.45%

AssetsNet

$ 43,135,561,029

Holdings Count | Holding

1,608

InvestmentCompanyPortfolioTurnover

223.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$43,135,561,029
# of Portfolio Holdings1,608
Portfolio Turnover Rate223%

Holdings [Text Block]

Mortgage-Backed	54.47%
U.S. Treasury Securities	29.59%
Corporates	17.04%
Asset-Backed Securities	5.34%
Short-Term Investments	4.26%
Bank Loans	1.43%
Foreign Government Obligations	0.65%
Municipal Bonds	0.41%
Common Stock	0.18%
Liabilities in Excess of Other Assets	(13.37)%

Largest Holdings [Text Block]

U.S. Treasury Notes (WI)	10.06%
U.S. Treasury Bonds (WI)	9.64%
U.S. Treasury Notes	9.13%
UMBS (TBA)	7.66%
Ginnie Mae (TBA)	4.99%
CIM Trust	4.11%
Ginnie Mae	1.14%
Fannie Mae Pool MA4626	1.07%
Credit Suisse Mortgage Capital Trust	1.06%
Bank of America Corp.	0.82%

Material Fund Change [Text Block]

Material Fund Changes

The Metropolitan West Total Return Bond Fund was renamed to the TCW MetWest Total Return Bond Fund on July 29, 2024.

Updated Prospectus Phone Number

800-386-3829

Updated Prospectus Web Address

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 six-month period ended September 30, 2024.

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).

Material Fund Change Notice [Text Block]

This report contains material fund changes that occurred during the period ended September 30, 2024.

Additional Information Phone Number

800-386-3829

Additional Information Website

www.tcw.com/Literature/Fund-Literature

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	0.52%

Expenses Paid, Amount

$ 27

Expense Ratio, Percent

0.52%

AssetsNet

$ 43,135,561,029

Holdings Count | Holding

1,608

InvestmentCompanyPortfolioTurnover

223.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$43,135,561,029
# of Portfolio Holdings1,608
Portfolio Turnover Rate223%

Holdings [Text Block]

Mortgage-Backed	54.47%
U.S. Treasury Securities	29.59%
Corporates	17.04%
Asset-Backed Securities	5.34%
Short-Term Investments	4.26%
Bank Loans	1.43%
Foreign Government Obligations	0.65%
Municipal Bonds	0.41%
Common Stock	0.18%
Liabilities in Excess of Other Assets	(13.37)%

Largest Holdings [Text Block]

U.S. Treasury Notes (WI)	10.06%
U.S. Treasury Bonds (WI)	9.64%
U.S. Treasury Notes	9.13%
UMBS (TBA)	7.66%
Ginnie Mae (TBA)	4.99%
CIM Trust	4.11%
Ginnie Mae	1.14%
Fannie Mae Pool MA4626	1.07%
Credit Suisse Mortgage Capital Trust	1.06%
Bank of America Corp.	0.82%

Material Fund Change [Text Block]

Material Fund Changes

The Metropolitan West Total Return Bond Fund was renamed to the TCW MetWest Total Return Bond Fund on July 29, 2024.

Updated Prospectus Phone Number

800-386-3829

Updated Prospectus Web Address

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 six-month period ended September 30, 2024.

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).

Material Fund Change Notice [Text Block]

This report contains material fund changes that occurred during the period ended September 30, 2024.

Additional Information Phone Number

800-386-3829

Additional Information Website

www.tcw.com/Literature/Fund-Literature

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	0.67%

Expenses Paid, Amount

$ 35

Expense Ratio, Percent

0.67%

AssetsNet

$ 43,135,561,029

Holdings Count | Holding

1,608

InvestmentCompanyPortfolioTurnover

223.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$43,135,561,029
# of Portfolio Holdings1,608
Portfolio Turnover Rate223%

Holdings [Text Block]

Mortgage-Backed	54.47%
U.S. Treasury Securities	29.59%
Corporates	17.04%
Asset-Backed Securities	5.34%
Short-Term Investments	4.26%
Bank Loans	1.43%
Foreign Government Obligations	0.65%
Municipal Bonds	0.41%
Common Stock	0.18%
Liabilities in Excess of Other Assets	(13.37)%

Largest Holdings [Text Block]

U.S. Treasury Notes (WI)	10.06%
U.S. Treasury Bonds (WI)	9.64%
U.S. Treasury Notes	9.13%
UMBS (TBA)	7.66%
Ginnie Mae (TBA)	4.99%
CIM Trust	4.11%
Ginnie Mae	1.14%
Fannie Mae Pool MA4626	1.07%
Credit Suisse Mortgage Capital Trust	1.06%
Bank of America Corp.	0.82%

Material Fund Change [Text Block]

Material Fund Changes

The Metropolitan West Total Return Bond Fund was renamed to the TCW MetWest Total Return Bond Fund on July 29, 2024.

Updated Prospectus Phone Number

800-386-3829

Updated Prospectus Web Address

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 six-month period ended September 30, 2024.

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).

Material Fund Change Notice [Text Block]

This report contains material fund changes that occurred during the period ended September 30, 2024.

Additional Information Phone Number

800-386-3829

Additional Information Website

www.tcw.com/Literature/Fund-Literature

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	0.37%

Expenses Paid, Amount

$ 19

Expense Ratio, Percent

0.37%

AssetsNet

$ 43,135,561,029

Holdings Count | Holding

1,608

InvestmentCompanyPortfolioTurnover

223.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$43,135,561,029
# of Portfolio Holdings1,608
Portfolio Turnover Rate223%

Holdings [Text Block]

Mortgage-Backed	54.47%
U.S. Treasury Securities	29.59%
Corporates	17.04%
Asset-Backed Securities	5.34%
Short-Term Investments	4.26%
Bank Loans	1.43%
Foreign Government Obligations	0.65%
Municipal Bonds	0.41%
Common Stock	0.18%
Liabilities in Excess of Other Assets	(13.37)%

Largest Holdings [Text Block]

U.S. Treasury Notes (WI)	10.06%
U.S. Treasury Bonds (WI)	9.64%
U.S. Treasury Notes	9.13%
UMBS (TBA)	7.66%
Ginnie Mae (TBA)	4.99%
CIM Trust	4.11%
Ginnie Mae	1.14%
Fannie Mae Pool MA4626	1.07%
Credit Suisse Mortgage Capital Trust	1.06%
Bank of America Corp.	0.82%

Material Fund Change [Text Block]

Material Fund Changes

The Metropolitan West Total Return Bond Fund was renamed to the TCW MetWest Total Return Bond Fund on July 29, 2024.

Updated Prospectus Phone Number

800-386-3829

Updated Prospectus Web Address

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 six-month period ended September 30, 2024.

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).

Material Fund Change Notice [Text Block]

This report contains material fund changes that occurred during the period ended September 30, 2024.

Additional Information Phone Number

800-386-3829

Additional Information Website

www.tcw.com/Literature/Fund-Literature

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%

Expenses Paid, Amount

$ 17

Expense Ratio, Percent

0.34%

AssetsNet

$ 47,123,670

Holdings Count | Holding

200

InvestmentCompanyPortfolioTurnover

262.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$47,123,670
# of Portfolio Holdings200
Portfolio Turnover Rate262%

Holdings [Text Block]

Mortgage-Backed	45.02%
U.S. Treasury Securities	29.24%
Corporates	25.92%
Short-Term Investments	10.00%
Asset-Backed Securities	7.26%
Municipal Bonds	0.24%
Liabilities in Excess of Other Assets	(17.68)%

Largest Holdings [Text Block]

U.S. Treasury Notes	19.04%
UMBS (TBA)	13.12%
Ginnie Mae	7.06%
U.S. Treasury Notes (WI)	6.26%
Ginnie Mae (TBA)	4.11%
U.S. International Development Finance Corp.	3.95%
Fannie Mae REMICS	3.48%
JPMorgan Chase & Co.	2.40%
Bank of America Corp.	2.21%
Wells Fargo & Co.	1.95%

Material Fund Change [Text Block]

Material Fund Changes

The Metropolitan West Ultra Short Bond Fund was renamed to the TCW MetWest Ultra Short Bond Fund on July 29, 2024.

Updated Prospectus Phone Number

800-386-3829

Updated Prospectus Web Address

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 six-month period ended September 30, 2024.

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).

Material Fund Change Notice [Text Block]

This report contains material fund changes that occurred during the period ended September 30, 2024.

Additional Information Phone Number

800-386-3829

Additional Information Website

www.tcw.com/Literature/Fund-Literature

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	$26	0.50%

Expenses Paid, Amount

$ 26

Expense Ratio, Percent

0.50%

AssetsNet

$ 47,123,670

Holdings Count | Holding

200

InvestmentCompanyPortfolioTurnover

262.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$47,123,670
# of Portfolio Holdings200
Portfolio Turnover Rate262%

Holdings [Text Block]

Mortgage-Backed	45.02%
U.S. Treasury Securities	29.24%
Corporates	25.92%
Short-Term Investments	10.00%
Asset-Backed Securities	7.26%
Municipal Bonds	0.24%
Liabilities in Excess of Other Assets	(17.68)%

Largest Holdings [Text Block]

U.S. Treasury Notes	19.04%
UMBS (TBA)	13.12%
Ginnie Mae	7.06%
U.S. Treasury Notes (WI)	6.26%
Ginnie Mae (TBA)	4.11%
U.S. International Development Finance Corp.	3.95%
Fannie Mae REMICS	3.48%
JPMorgan Chase & Co.	2.40%
Bank of America Corp.	2.21%
Wells Fargo & Co.	1.95%

Material Fund Change [Text Block]

Material Fund Changes

The Metropolitan West Ultra Short Bond Fund was renamed to the TCW MetWest Ultra Short Bond Fund on July 29, 2024.

Updated Prospectus Phone Number

800-386-3829

Updated Prospectus Web Address

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 six-month period ended September 30, 2024.

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).

Material Fund Change Notice [Text Block]

This report contains material fund changes that occurred during the period ended September 30, 2024.

Additional Information Phone Number

800-386-3829

Additional Information Website

www.tcw.com/Literature/Fund-Literature

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	$39	0.76%

Expenses Paid, Amount

$ 39

Expense Ratio, Percent

0.76%

AssetsNet

$ 2,668,718,507

Holdings Count | Holding

840

InvestmentCompanyPortfolioTurnover

78.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$2,668,718,507
# of Portfolio Holdings840
Portfolio Turnover Rate78%

Holdings [Text Block]

Mortgage-Backed	60.40%
Corporates	18.80%
Asset-Backed Securities	13.29%
Short-Term Investments	9.72%
Bank Loans	3.41%
Foreign Government Obligations	1.86%
Common Stock	0.40%
Municipal Bonds	0.32%
Liabilities in Excess of Other Assets	(8.20)%

Largest Holdings [Text Block]

UMBS (TBA)	4.90%
CIM Trust	3.97%
Ginnie Mae (TBA)	3.81%
SLM Student Loan Trust	1.47%
JPMorgan Chase & Co.	1.35%
Freddie Mac Pool SD8199	1.22%
Freddie Mac Pool SD8275	1.21%
IndyMac Index Mortgage Loan Trust	1.13%
ACE Securities Corp. Home Equity Loan Trust	1.10%
HSI Asset Securitization Corp. Trust	1.01%

Material Fund Change [Text Block]

Material Fund Changes

The Metropolitan West Unconstrained Bond Fund was renamed to the TCW MetWest Unconstrained Bond Fund on July 29, 2024.

Updated Prospectus Phone Number

800-386-3829

Updated Prospectus Web Address

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 six-month period ended September 30, 2024.

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).

Material Fund Change Notice [Text Block]

This report contains material fund changes that occurred during the period ended September 30, 2024.

Additional Information Phone Number

800-386-3829

Additional Information Website

www.tcw.com/Literature/Fund-Literature

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	$54	1.04%

Expenses Paid, Amount

$ 54

Expense Ratio, Percent

1.04%

AssetsNet

$ 2,668,718,507

Holdings Count | Holding

840

InvestmentCompanyPortfolioTurnover

78.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$2,668,718,507
# of Portfolio Holdings840
Portfolio Turnover Rate78%

Holdings [Text Block]

Mortgage-Backed	60.40%
Corporates	18.80%
Asset-Backed Securities	13.29%
Short-Term Investments	9.72%
Bank Loans	3.41%
Foreign Government Obligations	1.86%
Common Stock	0.40%
Municipal Bonds	0.32%
Liabilities in Excess of Other Assets	(8.20)%

Largest Holdings [Text Block]

UMBS (TBA)	4.90%
CIM Trust	3.97%
Ginnie Mae (TBA)	3.81%
SLM Student Loan Trust	1.47%
JPMorgan Chase & Co.	1.35%
Freddie Mac Pool SD8199	1.22%
Freddie Mac Pool SD8275	1.21%
IndyMac Index Mortgage Loan Trust	1.13%
ACE Securities Corp. Home Equity Loan Trust	1.10%
HSI Asset Securitization Corp. Trust	1.01%

Material Fund Change [Text Block]

Material Fund Changes

The Metropolitan West Unconstrained Bond Fund was renamed to the TCW MetWest Unconstrained Bond Fund on July 29, 2024.

Updated Prospectus Phone Number

800-386-3829

Updated Prospectus Web Address

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 six-month period ended September 30, 2024.

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).

Material Fund Change Notice [Text Block]

This report contains material fund changes that occurred during the period ended September 30, 2024.

Additional Information Phone Number

800-386-3829

Additional Information Website

www.tcw.com/Literature/Fund-Literature

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	$36	0.70%

Expenses Paid, Amount

$ 36

Expense Ratio, Percent

0.70%

AssetsNet

$ 2,668,718,507

Holdings Count | Holding

840

InvestmentCompanyPortfolioTurnover

78.00%

Additional Fund Statistics [Text Block]

Key Fund Statistics

Total Net Assets$2,668,718,507
# of Portfolio Holdings840
Portfolio Turnover Rate78%

Holdings [Text Block]

Mortgage-Backed	60.40%
Corporates	18.80%
Asset-Backed Securities	13.29%
Short-Term Investments	9.72%
Bank Loans	3.41%
Foreign Government Obligations	1.86%
Common Stock	0.40%
Municipal Bonds	0.32%
Liabilities in Excess of Other Assets	(8.20)%

Largest Holdings [Text Block]

UMBS (TBA)	4.90%
CIM Trust	3.97%
Ginnie Mae (TBA)	3.81%
SLM Student Loan Trust	1.47%
JPMorgan Chase & Co.	1.35%
Freddie Mac Pool SD8199	1.22%
Freddie Mac Pool SD8275	1.21%
IndyMac Index Mortgage Loan Trust	1.13%
ACE Securities Corp. Home Equity Loan Trust	1.10%
HSI Asset Securitization Corp. Trust	1.01%

Material Fund Change [Text Block]

Material Fund Changes

The Metropolitan West Unconstrained Bond Fund was renamed to the TCW MetWest Unconstrained Bond Fund on July 29, 2024.

Updated Prospectus Phone Number

800-386-3829

Updated Prospectus Web Address