This annual shareholder report contains important information about the AB Government Money Market Portfolio (the “Portfolio”) for the period of May 1, 2024 to April 30, 2025.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Portfolio at https://www.abfunds.com/link/AB/AEYXX-A. You can also request this information by contacting us at (800) 227 4618.

Additional Information Phone Number

(800) 227 4618

Additional Information Website

https://www.abfunds.com/link/AB/AEYXX-A

Expenses [Text Block]

What were the Portfolio costs for the last year?

(Based on a hypothetical $10,000 investment)

Class Name	Cost of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Advisor Class	$24	0.23%

Expenses Paid, Amount

$ 24

Expense Ratio, Percent

0.23%

AssetsNet

$ 24,598,337,892

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 42,851,745

Additional Fund Statistics [Text Block]

Key Portfolio Statistics

Net Assets	$24,598,337,892
# of Portfolio Holdings	85
Total Advisory Fees Paid	$42,851,745

Holdings [Text Block]

Maturity Weightings (% of Total Investments)

1 - 7 Days	38.5%
8 - 30 Days	10.6%
31 - 60 Days	11.6%
61 - 90 Days	1.8%
91 - 180 Days	21.4%
Over 180 Days	16.1%
Total	100.0%

Material Fund Change Expenses [Text Block]

AllianceBernstein L.P., the Adviser, discontinued a contractual agreement to waive 0.05% of the Portfolio's management fee upon the expiration of the term of the agreement on August 31, 2024. Effective September 1, 2024, the contractual management fee for the Portfolio is 0.20% of net assets.

Summary of Change Legend [Text Block]

This is a summary of certain changes to the Fund during the reporting period.

C000172513

Shareholder Report [Line Items]

Fund Name

AB Government Money Market Portfolio

Class Name

Class 1

Trading Symbol

AGRXX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about the AB Government Money Market Portfolio (the “Portfolio”) for the period of May 1, 2024 to April 30, 2025.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Portfolio at https://www.abfunds.com/link/AB/AGRXX-A. You can also request this information by contacting us at (800) 227 4618.

Additional Information Phone Number

(800) 227 4618

Additional Information Website

https://www.abfunds.com/link/AB/AGRXX-A

Expenses [Text Block]

What were the Portfolio costs for the last year?

(Based on a hypothetical $10,000 investment)

Class Name	Cost of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class 1	$30	0.29%

Expenses Paid, Amount

$ 30

Expense Ratio, Percent

0.29%

AssetsNet

$ 24,598,337,892

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 42,851,745

Additional Fund Statistics [Text Block]

Key Portfolio Statistics

Net Assets	$24,598,337,892
# of Portfolio Holdings	85
Total Advisory Fees Paid	$42,851,745

Holdings [Text Block]

Maturity Weightings (% of Total Investments)

1 - 7 Days	38.5%
8 - 30 Days	10.6%
31 - 60 Days	11.6%
61 - 90 Days	1.8%
91 - 180 Days	21.4%
Over 180 Days	16.1%
Total	100.0%

Material Fund Change Expenses [Text Block]

Summary of Change Legend [Text Block]

This is a summary of certain changes to the Fund during the reporting period.

C000172514

Shareholder Report [Line Items]

Fund Name

AB Government Money Market Portfolio

Class Name

Class A

Trading Symbol

AEAXX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about the AB Government Money Market Portfolio (the “Portfolio”) for the period of May 1, 2024 to April 30, 2025.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Portfolio at https://www.abfunds.com/link/AB/AEAXX-A. You can also request this information by contacting us at (800) 227 4618.

Additional Information Phone Number

(800) 227 4618

Additional Information Website

https://www.abfunds.com/link/AB/AEAXX-A

Expenses [Text Block]

What were the Portfolio costs for the last year?

(Based on a hypothetical $10,000 investment)

Class Name	Cost of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$24	0.23%

Expenses Paid, Amount

$ 24

Expense Ratio, Percent

0.23%

AssetsNet

$ 24,598,337,892

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 42,851,745

Additional Fund Statistics [Text Block]

Key Portfolio Statistics

Net Assets	$24,598,337,892
# of Portfolio Holdings	85
Total Advisory Fees Paid	$42,851,745

Holdings [Text Block]

Maturity Weightings (% of Total Investments)

1 - 7 Days	38.5%
8 - 30 Days	10.6%
31 - 60 Days	11.6%
61 - 90 Days	1.8%
91 - 180 Days	21.4%
Over 180 Days	16.1%
Total	100.0%

Material Fund Change Expenses [Text Block]

Summary of Change Legend [Text Block]

This is a summary of certain changes to the Fund during the reporting period.

C000032709

Shareholder Report [Line Items]

Fund Name

AB Government Money Market Portfolio

Class Name

Class AB

Trading Symbol

MYMXX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about the AB Government Money Market Portfolio (the “Portfolio”) for the period of May 1, 2024 to April 30, 2025.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Portfolio at https://www.abfunds.com/link/AB/MYMXX-A. You can also request this information by contacting us at (800) 227 4618.

Additional Information Phone Number

(800) 227 4618

Additional Information Website

https://www.abfunds.com/link/AB/MYMXX-A

Expenses [Text Block]

What were the Portfolio costs for the last year?

(Based on a hypothetical $10,000 investment)

Class Name	Cost of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class AB	$19	0.19%

Expenses Paid, Amount

$ 19

Expense Ratio, Percent

0.19%

AssetsNet

$ 24,598,337,892

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 42,851,745

Additional Fund Statistics [Text Block]

Key Portfolio Statistics

Net Assets	$24,598,337,892
# of Portfolio Holdings	85
Total Advisory Fees Paid	$42,851,745

Holdings [Text Block]

Maturity Weightings (% of Total Investments)

1 - 7 Days	38.5%
8 - 30 Days	10.6%
31 - 60 Days	11.6%
61 - 90 Days	1.8%
91 - 180 Days	21.4%
Over 180 Days	16.1%
Total	100.0%

Material Fund Change Expenses [Text Block]

Summary of Change Legend [Text Block]

This is a summary of certain changes to the Fund during the reporting period.

C000172515

Shareholder Report [Line Items]

Fund Name

AB Government Money Market Portfolio

Class Name

Class C

Trading Symbol

AECXX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about the AB Government Money Market Portfolio (the “Portfolio”) for the period of May 1, 2024 to April 30, 2025.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Portfolio at https://www.abfunds.com/link/AB/AECXX-A. You can also request this information by contacting us at (800) 227 4618.

Additional Information Phone Number

(800) 227 4618

Additional Information Website

https://www.abfunds.com/link/AB/AECXX-A

Expenses [Text Block]

What were the Portfolio costs for the last year?

(Based on a hypothetical $10,000 investment)

Class Name	Cost of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class C	$24	0.23%

Expenses Paid, Amount

$ 24

Expense Ratio, Percent

0.23%

AssetsNet

$ 24,598,337,892

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 42,851,745

Additional Fund Statistics [Text Block]

Key Portfolio Statistics

Net Assets	$24,598,337,892
# of Portfolio Holdings	85
Total Advisory Fees Paid	$42,851,745

Holdings [Text Block]

Maturity Weightings (% of Total Investments)

1 - 7 Days	38.5%
8 - 30 Days	10.6%
31 - 60 Days	11.6%
61 - 90 Days	1.8%
91 - 180 Days	21.4%
Over 180 Days	16.1%
Total	100.0%

Material Fund Change Expenses [Text Block]

Summary of Change Legend [Text Block]

This is a summary of certain changes to the Fund during the reporting period.

C000172516

Shareholder Report [Line Items]

Fund Name

AB Government Money Market Portfolio

Class Name

Class I

Trading Symbol

AIEXX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about the AB Government Money Market Portfolio (the “Portfolio”) for the period of May 1, 2024 to April 30, 2025.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Portfolio at https://www.abfunds.com/link/AB/AIEXX-A. You can also request this information by contacting us at (800) 227 4618.

Additional Information Phone Number

(800) 227 4618

Additional Information Website

https://www.abfunds.com/link/AB/AIEXX-A

Expenses [Text Block]

What were the Portfolio costs for the last year?

(Based on a hypothetical $10,000 investment)

Class Name	Cost of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$22	0.21%

Expenses Paid, Amount

$ 22

Expense Ratio, Percent

0.21%

AssetsNet

$ 24,598,337,892

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 42,851,745

Additional Fund Statistics [Text Block]

Key Portfolio Statistics

Net Assets	$24,598,337,892
# of Portfolio Holdings	85
Total Advisory Fees Paid	$42,851,745

Holdings [Text Block]

Maturity Weightings (% of Total Investments)

1 - 7 Days	38.5%
8 - 30 Days	10.6%
31 - 60 Days	11.6%
61 - 90 Days	1.8%
91 - 180 Days	21.4%
Over 180 Days	16.1%
Total	100.0%

Material Fund Change Expenses [Text Block]

Summary of Change Legend [Text Block]

This is a summary of certain changes to the Fund during the reporting period.

C000172520

Shareholder Report [Line Items]

Fund Name

AB Government Money Market Portfolio

Class Name

Institutional Class

Trading Symbol

GMOXX

Annual or Semi-Annual Statement [Text Block]

This annual shareholder report contains important information about the AB Government Money Market Portfolio (the “Portfolio”) for the period of May 1, 2024 to April 30, 2025.

Shareholder Report Annual or Semi-Annual

Annual Shareholder Report

Additional Information [Text Block]

You can find additional information about the Portfolio at https://www.abfunds.com/link/AB/GMOXX-A. You can also request this information by contacting us at (800) 227 4618.

Additional Information Phone Number

(800) 227 4618

Additional Information Website

https://www.abfunds.com/link/AB/GMOXX-A

Expenses [Text Block]