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Fair Value Measurement - Quantitative Information - Assets & Liabilities (Details) - Level 3 - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Valuation, Income Approach | Credit derivative liabilities, net
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value	$ (148)	$ (162)
Valuation, Income Approach | FG VIEs' assets
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value	(704)	(715)
Valuation, Income Approach | Collateralized Loan Obligations | Consolidated Investment Vehicles
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value		(4,090)
Valuation, Income Approach | CLO obligations of CFEs | Consolidated Investment Vehicles
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value	(4,155)
Valuation, Income Approach | Securitized borrowing | Consolidated Investment Vehicles
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value	(28)	(28)
Valuation, Income Approach | Warehouse financing debt | Consolidated Investment Vehicles
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value	$ (37)	$ (36)
Minimum | Credit derivative liabilities, net
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Hedge cost (as a percent)	0.15%
Bank profit (as a percent)	0.496%	5100.00%
Minimum | Valuation, Income Approach | Credit derivative liabilities, net
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Hedge cost (as a percent)		11.50%
Minimum | Valuation, Income Approach | FG VIEs' assets
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	4.50%	4.80%
Minimum | Valuation, Income Approach | CLO obligations of CFEs | Consolidated Investment Vehicles
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	3.90%	3.00%
Minimum | Valuation, Income Approach | Warehouse financing debt | Consolidated Investment Vehicles
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	0.00%	11.70%
Maximum | Credit derivative liabilities, net
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Hedge cost (as a percent)	0.33%
Bank profit (as a percent)	3.068%	27050.00%
Maximum | Valuation, Income Approach | Credit derivative liabilities, net
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Hedge cost (as a percent)		25.20%
Maximum | Valuation, Income Approach | FG VIEs' assets
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	10.40%	10.90%
Maximum | Valuation, Income Approach | CLO obligations of CFEs | Consolidated Investment Vehicles
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	21.50%	27.40%
Maximum | Valuation, Income Approach | Warehouse financing debt | Consolidated Investment Vehicles
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	9.50%	16.90%
Weighted Average | Credit derivative liabilities, net
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Hedge cost (as a percent)	0.206%
Bank profit (as a percent)	1.095%	10940.00%
Weighted Average | Valuation, Income Approach | Credit derivative liabilities, net
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Hedge cost (as a percent)		15.70%
Weighted Average | Valuation, Income Approach | FG VIEs' assets
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	5.70%	5.90%
Weighted Average | Valuation, Income Approach | CLO obligations of CFEs | Consolidated Investment Vehicles
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	6.50%	5.50%
Weighted Average | Valuation, Income Approach | Warehouse financing debt | Consolidated Investment Vehicles
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	6.90%	12.90%
CPR | Minimum | Valuation, Income Approach | FG VIEs' assets
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	2.30%	0.90%
CPR | Maximum | Valuation, Income Approach | FG VIEs' assets
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	24.80%	21.90%
CPR | Weighted Average | Valuation, Income Approach | FG VIEs' assets
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	10.20%	6.30%
CDR | Minimum | Valuation, Income Approach | FG VIEs' assets
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	1.30%	1.30%
CDR | Maximum | Valuation, Income Approach | FG VIEs' assets
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	41.00%	41.00%
CDR | Weighted Average | Valuation, Income Approach | FG VIEs' assets
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	9.10%	3.70%
Loss severity | Minimum | Valuation, Income Approach | FG VIEs' assets
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	45.00%	45.00%
Loss severity | Maximum | Valuation, Income Approach | FG VIEs' assets
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	100.00%	100.00%
Loss severity | Weighted Average | Valuation, Income Approach | FG VIEs' assets
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	82.40%	39.90%
Discount Margin | Valuation, Income Approach | Securitized borrowing | Consolidated Investment Vehicles
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	23.70%	20.90%
Terminal growth rate | Valuation, Income Approach | Securitized borrowing | Consolidated Investment Vehicles
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	3.00%	3.00%
Market multiple-enterprise value/EBITDA | Minimum | Valuation, Market Approach | Securitized borrowing | Consolidated Investment Vehicles
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market multiple-enterprise value/EBITDA	10.50	10
Market multiple-enterprise value/EBITDA | Maximum | Valuation, Market Approach | Securitized borrowing | Consolidated Investment Vehicles
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market multiple-enterprise value/EBITDA	11.50	11
Market multiple-enterprise value/EBITDA | Weighted Average | Valuation, Market Approach | Securitized borrowing | Consolidated Investment Vehicles
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market multiple-enterprise value/EBITDA	11.00	10.5
Exit multiple-EBITDA | Valuation, Income Approach | Securitized borrowing | Consolidated Investment Vehicles
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	1100.00%	1100.00%
Obligations of state and political subdivisions | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total assets carried at fair value	$ 47	$ 47
Obligations of state and political subdivisions | Minimum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	7.20%	7.40%
Obligations of state and political subdivisions | Maximum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	12.80%	13.50%
Obligations of state and political subdivisions | Weighted Average | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	9.10%	9.40%
RMBS | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total assets carried at fair value	$ 174	$ 179
RMBS | Minimum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	7.10%	7.50%
RMBS | Maximum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	11.00%	11.30%
RMBS | Weighted Average | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	8.60%	9.00%
RMBS | CPR | Minimum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	2.20%	3.80%
RMBS | CPR | Maximum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	15.30%	16.10%
RMBS | CPR | Weighted Average | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	5.60%	8.20%
RMBS | CDR | Minimum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	1.50%	1.50%
RMBS | CDR | Maximum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	16.00%	12.00%
RMBS | CDR | Weighted Average | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	6.10%	5.90%
RMBS | Loss severity | Minimum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	50.00%	50.00%
RMBS | Loss severity | Maximum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	125.00%	125.00%
RMBS | Loss severity | Weighted Average | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	82.50%	82.50%
Life insurance transactions | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total assets carried at fair value	$ 340	$ 342
Yield (as a percent)	11.40%	11.30%
CLOs | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total assets carried at fair value	$ 433	$ 428
CLOs | Discount Margin | Minimum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)		1.80%
CLOs | Discount Margin | Maximum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)		4.10%
CLOs | Discount Margin | Weighted Average | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)		3.00%
Others | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total assets carried at fair value	$ 22	$ 24
Others | Minimum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	6.70%	7.40%
Others | Maximum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	12.90%	12.90%
Others | Weighted Average | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	12.80%	12.80%
FG VIEs' assets | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total assets carried at fair value	$ 197	$ 204
FG VIEs' assets | Minimum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	7.40%	6.60%
FG VIEs' assets | Maximum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	10.40%	10.90%
FG VIEs' assets | Weighted Average | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	9.10%	7.50%
FG VIEs' assets | CPR | Minimum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	2.30%	0.90%
FG VIEs' assets | CPR | Maximum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	24.80%	21.90%
FG VIEs' assets | CPR | Weighted Average | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	10.20%	12.90%
FG VIEs' assets | CDR | Minimum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	1.30%	1.30%
FG VIEs' assets | CDR | Maximum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	41.00%	41.00%
FG VIEs' assets | CDR | Weighted Average | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	9.10%	7.60%
FG VIEs' assets | Loss severity | Minimum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	45.00%	45.00%
FG VIEs' assets | Loss severity | Maximum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	100.00%	100.00%
FG VIEs' assets | Loss severity | Weighted Average | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate	82.40%	81.00%
Other | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total assets carried at fair value	$ 31	$ 47
Term (years)	10 years	10 years
Other | Minimum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	7.80%	7.70%
Other | Maximum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	8.30%	8.40%
Other | Weighted Average | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	8.00%	8.10%
Consolidated Investment Vehicles | Valuation, Income Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total assets carried at fair value	$ 329	$ 297
Yield (as a percent)	8.70%	10.00%
Consolidated Investment Vehicles | Valuation, Income Approach | Corporate securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total assets carried at fair value	$ 93	$ 96
Yield (as a percent)	16.30%	16.30%
Consolidated Investment Vehicles | Valuation, Income Approach | Structured products
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total assets carried at fair value	$ 17	$ 46
Consolidated Investment Vehicles | Minimum | Valuation, Income Approach | Structured products
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	15.70%	12.80%
Consolidated Investment Vehicles | Maximum | Valuation, Income Approach | Structured products
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	26.90%	37.10%
Consolidated Investment Vehicles | Weighted Average | Valuation, Income Approach | Structured products
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	20.80%	18.90%
Consolidated Investment Vehicles | Discount Margin | Minimum | Valuation, Income Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	20.40%	19.80%
Consolidated Investment Vehicles | Discount Margin | Minimum | Valuation, Income Approach | Corporate securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	20.60%	20.80%
Consolidated Investment Vehicles | Discount Margin | Maximum | Valuation, Income Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	27.20%	25.10%
Consolidated Investment Vehicles | Discount Margin | Maximum | Valuation, Income Approach | Corporate securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	21.10%	23.80%
Consolidated Investment Vehicles | Discount Margin | Weighted Average | Valuation, Income Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	22.90%	22.70%
Consolidated Investment Vehicles | Discount Margin | Weighted Average | Valuation, Income Approach | Corporate securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	20.70%	21.70%
Consolidated Investment Vehicles | Terminal growth rate | Minimum | Valuation, Income Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	3.00%	3.00%
Consolidated Investment Vehicles | Terminal growth rate | Maximum | Valuation, Income Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	4.00%	4.00%
Consolidated Investment Vehicles | Terminal growth rate | Weighted Average | Valuation, Income Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	3.50%	3.50%
Consolidated Investment Vehicles | Market multiple-enterprise value/revenue | Valuation, Market Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market multiple-price to book	110.00%	115.00%
Exit multiple-price to earnings	525.00%	450.00%
Consolidated Investment Vehicles | Market multiple-enterprise value/revenue | Minimum | Valuation, Market Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market multiple-enterprise value/revenue	1.05	1.05
Consolidated Investment Vehicles | Market multiple-enterprise value/revenue | Maximum | Valuation, Market Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market multiple-enterprise value/revenue	1.10	1.1
Consolidated Investment Vehicles | Market multiple-enterprise value/revenue | Weighted Average | Valuation, Market Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market multiple-enterprise value/revenue	1.08	1.08
Consolidated Investment Vehicles | Market multiple-enterprise value/EBITDA | Minimum | Valuation, Market Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market multiple-enterprise value/EBITDA	2.50	2.5
Consolidated Investment Vehicles | Market multiple-enterprise value/EBITDA | Minimum | Valuation, Market Approach | Corporate securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market multiple-enterprise value/EBITDA	2.50	2.5
Consolidated Investment Vehicles | Market multiple-enterprise value/EBITDA | Maximum | Valuation, Market Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market multiple-enterprise value/EBITDA	11.50	11
Consolidated Investment Vehicles | Market multiple-enterprise value/EBITDA | Maximum | Valuation, Market Approach | Corporate securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market multiple-enterprise value/EBITDA	2.75	2.75
Consolidated Investment Vehicles | Market multiple-enterprise value/EBITDA | Weighted Average | Valuation, Market Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market multiple-enterprise value/EBITDA	10.67	10.25
Consolidated Investment Vehicles | Market multiple-enterprise value/EBITDA | Weighted Average | Valuation, Market Approach | Corporate securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market multiple-enterprise value/EBITDA	2.63	2.63
Consolidated Investment Vehicles | Cost | Valuation, Income Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	100.00%	100.00%
Consolidated Investment Vehicles | Cost | Valuation, Income Approach | Corporate securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	100.00%	100.00%
Consolidated Investment Vehicles | Exit multiple-EBITDA | Valuation, Market Approach | Corporate securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	800.00%	800.00%
Consolidated Investment Vehicles | Exit multiple-EBITDA | Minimum | Valuation, Market Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	800.00%	800.00%
Consolidated Investment Vehicles | Exit multiple-EBITDA | Maximum | Valuation, Market Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	1200.00%	1200.00%
Consolidated Investment Vehicles | Exit multiple-EBITDA | Weighted Average | Valuation, Market Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	1014.00%	1053.00%
Consolidated Investment Vehicles | Exit multiple-price to earnings | Valuation, Market Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	550.00%	550.00%
Consolidated Investment Vehicles | Exit multiple-price to book | Valuation, Market Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	130.00%	130.00%
Consolidated Investment Vehicles | Measurement Input, Discount Rate on Sale | Minimum | Valuation, Market Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	4.40%
Consolidated Investment Vehicles | Measurement Input, Discount Rate on Sale | Minimum | Valuation, Market Approach | Corporate securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	4.40%
Consolidated Investment Vehicles | Measurement Input, Discount Rate on Sale | Maximum | Valuation, Market Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	5.50%
Consolidated Investment Vehicles | Measurement Input, Discount Rate on Sale | Maximum | Valuation, Market Approach | Corporate securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	5.50%
Consolidated Investment Vehicles | Measurement Input, Discount Rate on Sale | Weighted Average | Valuation, Market Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	4.90%
Consolidated Investment Vehicles | Measurement Input, Discount Rate on Sale | Weighted Average | Valuation, Market Approach | Corporate securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	4.90%
Consolidated Investment Vehicles | Proceeds Held Back and Discounted | Minimum | Valuation, Market Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	30.00%
Consolidated Investment Vehicles | Proceeds Held Back and Discounted | Minimum | Valuation, Market Approach | Corporate securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	30.00%
Consolidated Investment Vehicles | Proceeds Held Back and Discounted | Maximum | Valuation, Market Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	95.00%
Consolidated Investment Vehicles | Proceeds Held Back and Discounted | Maximum | Valuation, Market Approach | Corporate securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	95.00%
Consolidated Investment Vehicles | Proceeds Held Back and Discounted | Weighted Average | Valuation, Market Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	62.50%
Consolidated Investment Vehicles | Proceeds Held Back and Discounted | Weighted Average | Valuation, Market Approach | Corporate securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	62.50%
Collateralized Loan Obligations | Discount Margin | Minimum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	1.80%
Collateralized Loan Obligations | Discount Margin | Maximum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	4.00%
Collateralized Loan Obligations | Discount Margin | Weighted Average | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	2.90%
Other invested assets | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total assets carried at fair value	$ 5	$ 5

X

- Definition

Represents the bank profit (in basis points), used as an input to measure fair value.

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Definition

Represents the hedge cost (in basis points), used as an input to measure fair value.

+ References

No definition available.

+ Details

Name:	ago_FairValueInputsHedgeCost
Namespace Prefix:	ago_
Data Type:	dtr-types:percentItemType
Balance Type:	na
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X

- Definition

Fair Value Inputs, Market Multiple, Enterprise Value, EBITDA

+ References

No definition available.

+ Details

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Namespace Prefix:	ago_
Data Type:	xbrli:pureItemType
Balance Type:	na
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X

- Definition

Fair Value Inputs, Market Multiple, Enterprise Value, Revenue

+ References

No definition available.

+ Details

Name:	ago_FairValueInputsMarketMultipleEnterpriseValueRevenue
Namespace Prefix:	ago_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the term used as an input to measure fair value.

+ References

No definition available.

+ Details

Name:	ago_FairValueInputsTerm
Namespace Prefix:	ago_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the yield used as an input to measure fair value.

+ References

No definition available.

+ Details

Name:	ago_FairValueInputsYield
Namespace Prefix:	ago_
Data Type:	dtr-types:percentItemType
Balance Type:	na
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X

- Definition

Fair Value, Market Multiple, Price to Book

+ References

No definition available.

+ Details

Name:	ago_FairValueMarketMultiplePriceToBook
Namespace Prefix:	ago_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Fair Value, Market Multiple, Price to Earnings

+ References

No definition available.

+ Details

Name:	ago_FairValueMarketMultiplePriceToEarnings
Namespace Prefix:	ago_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

+ Details

Name:	us-gaap_AssetsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Estimated rate of prepayment of principal on financial assets for initial fair value measurement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)(2)
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