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Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Investments with no credit impairment, tax	$ 14	$ (121)	$ (31)
Investments with credit impairment, tax	$ 1	$ (20)	$ 2

X

- Definition

Other Comprehensive Income (Loss), Available-for-sale Securities, With Credit Impairment, Tax

+ References

No definition available.

+ Details

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Namespace Prefix:	ago_
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Balance Type:	debit
Period Type:	duration

X

- Definition

Other Comprehensive Income (Loss), Available-for-sale Securities, Without Credit Impairment, Tax

+ References

No definition available.

+ Details

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Namespace Prefix:	ago_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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