Fair Value Measurement - Quantitative Information - Assets (Details) - Level 3 - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Obligations of state and political subdivisions | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset, fair value	$ 47	$ 72
Obligations of state and political subdivisions | Minimum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	7.40%	4.40%
Obligations of state and political subdivisions | Maximum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	13.50%	24.50%
Obligations of state and political subdivisions | Weighted Average | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	9.40%	6.20%
RMBS | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset, fair value	$ 179	$ 216
RMBS | Minimum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	7.50%	3.80%
RMBS | Maximum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	11.30%	5.60%
RMBS | Weighted Average | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	9.00%	4.50%
Life insurance transactions | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset, fair value	$ 342
Yield (as a percent)	11.30%
CLO contracts | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset, fair value	$ 428	$ 458
Others | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset, fair value	$ 24	$ 38
Others | Minimum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	7.40%	3.20%
Others | Maximum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	12.90%	7.90%
Others | Weighted Average | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	12.80%	7.90%
Financial Guarantee Variable Interest Entities | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset, fair value	$ 204	$ 260
Financial Guarantee Variable Interest Entities | Minimum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	6.60%	1.40%
Financial Guarantee Variable Interest Entities | Maximum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	10.90%	8.00%
Financial Guarantee Variable Interest Entities | Weighted Average | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	7.50%	4.60%
Other | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset, fair value	$ 47	$ 23
Fair value inputs term	10 years	10 years
Other | Minimum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	7.70%	2.70%
Other | Maximum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	8.40%	3.30%
Other | Weighted Average | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	8.10%	3.00%
Other invested assets | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset, fair value	$ 5	$ 6
Life insurance transactions | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset, fair value		$ 367
Yield (as a percent)		5.00%
Consolidated Investment Vehicles | Valuation, Income Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset, fair value	$ 297	$ 239
Yield (as a percent)	10.00%	7.70%
Consolidated Investment Vehicles | Valuation, Income Approach | Corporate securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset, fair value	$ 96
Yield (as a percent)	16.30%	16.40%
Consolidated Investment Vehicles | Valuation, Income Approach | Structured products
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset, fair value	$ 46
Consolidated Investment Vehicles | Minimum | Valuation, Income Approach | Structured products
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	12.80%
Consolidated Investment Vehicles | Maximum | Valuation, Income Approach | Structured products
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	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)	18.90%
CPR | RMBS | Minimum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate (as a percent)	3.80%	0.00%
CPR | RMBS | Maximum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate (as a percent)	16.10%	22.70%
CPR | RMBS | Weighted Average | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate (as a percent)	8.20%	10.40%
CPR | Financial Guarantee Variable Interest Entities | Minimum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate (as a percent)	0.90%	0.90%
CPR | Financial Guarantee Variable Interest Entities | Maximum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate (as a percent)	21.90%	24.50%
CPR | Financial Guarantee Variable Interest Entities | Weighted Average | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate (as a percent)	12.90%	13.30%
CDR | RMBS | Minimum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate (as a percent)	1.50%	1.40%
CDR | RMBS | Maximum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate (as a percent)	12.00%	12.00%
CDR | RMBS | Weighted Average | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate (as a percent)	5.90%	5.90%
CDR | Financial Guarantee Variable Interest Entities | Minimum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate (as a percent)	1.30%	1.40%
CDR | Financial Guarantee Variable Interest Entities | Maximum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate (as a percent)	41.00%	26.90%
CDR | Financial Guarantee Variable Interest Entities | Weighted Average | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate (as a percent)	7.60%	7.60%
Loss severity | RMBS | Minimum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate (as a percent)	50.00%	50.00%
Loss severity | RMBS | Maximum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate (as a percent)	125.00%	125.00%
Loss severity | RMBS | Weighted Average | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate (as a percent)	82.50%	84.90%
Loss severity | Financial Guarantee Variable Interest Entities | Minimum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate (as a percent)	45.00%	45.00%
Loss severity | Financial Guarantee Variable Interest Entities | Maximum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate (as a percent)	100.00%	100.00%
Loss severity | Financial Guarantee Variable Interest Entities | Weighted Average | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Conditional prepayment rate (as a percent)	81.00%	81.60%
Discount rate | Valuation, Income Approach | Corporate securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Asset, fair value		$ 91
Discount rate | Minimum | Valuation, Income Approach | Corporate securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)		14.70%
Discount rate | Maximum | Valuation, Income Approach | Corporate securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)		21.40%
Discount rate | Weighted Average | Valuation, Income Approach | Corporate securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)		17.80%
Discount rate | CLO contracts | Minimum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	1.80%	0.00%
Discount rate | CLO contracts | Maximum | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	4.10%	2.90%
Discount rate | CLO contracts | Weighted Average | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	3.00%	1.80%
Discount rate | Consolidated Investment Vehicles | Minimum | Valuation, Income Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	19.80%	14.70%
Discount rate | Consolidated Investment Vehicles | Minimum | Valuation, Income Approach | Corporate securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	20.80%
Discount rate | Consolidated Investment Vehicles | Maximum | Valuation, Income Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	25.10%	23.90%
Discount rate | Consolidated Investment Vehicles | Maximum | Valuation, Income Approach | Corporate securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	23.80%
Discount rate | Consolidated Investment Vehicles | Weighted Average | Valuation, Income Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	22.70%	21.60%
Discount rate | Consolidated Investment Vehicles | Weighted Average | Valuation, Income Approach | Corporate securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	21.70%
Multiple enterprise/revenue value | Valuation, Market Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market multiple-enterprise value/revenue		1.10
Multiple enterprise/revenue value | Consolidated Investment Vehicles | Valuation, Market Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market multiple-price to book		185.00%
Multiple enterprise/revenue value | Consolidated Investment Vehicles | Minimum | Valuation, Market Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market multiple-enterprise value/revenue	1.05
Market multiple-price to book	115.00%
Market multiple-price to earnings	450.00%
Multiple enterprise/revenue value | Consolidated Investment Vehicles | Maximum | Valuation, Market Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market multiple-enterprise value/revenue	1.10
Multiple enterprise/revenue value | Consolidated Investment Vehicles | 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
Measurement Input, EBITDA Multiple | Minimum | Valuation, Market Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market multiple - enterprise value/EBITDA		3.00
Measurement Input, EBITDA Multiple | Maximum | Valuation, Market Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market multiple - enterprise value/EBITDA		10.50
Measurement Input, EBITDA Multiple | Weighted Average | Valuation, Market Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market multiple - enterprise value/EBITDA		8.95
Measurement Input, EBITDA Multiple | Consolidated Investment Vehicles | Minimum | Valuation, Market Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market multiple - enterprise value/EBITDA	2.50
Measurement Input, EBITDA Multiple | Consolidated Investment Vehicles | Minimum | Valuation, Market Approach | Corporate securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market multiple - enterprise value/EBITDA	2.50
Measurement Input, EBITDA Multiple | Consolidated Investment Vehicles | Maximum | Valuation, Market Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market multiple - enterprise value/EBITDA	11.00
Measurement Input, EBITDA Multiple | Consolidated Investment Vehicles | Maximum | Valuation, Market Approach | Corporate securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market multiple - enterprise value/EBITDA	2.75
Measurement Input, EBITDA Multiple | Consolidated Investment Vehicles | Weighted Average | Valuation, Market Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market multiple - enterprise value/EBITDA	10.25
Measurement Input, EBITDA Multiple | Consolidated Investment Vehicles | Weighted Average | Valuation, Market Approach | Corporate securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market multiple - enterprise value/EBITDA	2.63
Measurement Input, Long-Term Revenue Growth Rate | Consolidated Investment Vehicles | Minimum | Valuation, Income Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	3.00%
Measurement Input, Long-Term Revenue Growth Rate | Consolidated Investment Vehicles | Maximum | Valuation, Income Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	4.00%
Measurement Input, Long-Term Revenue Growth Rate | Consolidated Investment Vehicles | Weighted Average | Valuation, Income Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	3.50%
Measurement Input, Exit Multiple, EBITDA | Consolidated Investment Vehicles | Valuation, Market Approach | Corporate securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	800.00%
Measurement Input, Exit Multiple, EBITDA | Consolidated Investment Vehicles | Minimum | Valuation, Market Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	800.00%
Measurement Input, Exit Multiple, EBITDA | Consolidated Investment Vehicles | Maximum | Valuation, Market Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	1200.00%
Measurement Input, Exit Multiple, EBITDA | Consolidated Investment Vehicles | Weighted Average | Valuation, Market Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	1053.00%
Measurement Input, Price to Book | Consolidated Investment Vehicles | Valuation, Market Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	130.00%
Measurement Input, Price to Earnings | Consolidated Investment Vehicles | Valuation, Market Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	550.00%
Measurement Input, Cost to Sell | Consolidated Investment Vehicles | Valuation, Income Approach | Equity securities and warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	100.00%
Measurement Input, Cost to Sell | Consolidated Investment Vehicles | Valuation, Income Approach | Corporate securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Yield (as a percent)	100.00%