Fair Value of Financial Instruments - Quantitative Information of Unobservable Inputs Used for Level Three Fair Value Measurements of Financial Instruments on Recurring Basis (Detail) $ in Millions	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value	$ 8,169	$ 5,600
Liabilities, fair value	3,115	$ 3,883
FIA embedded derivatives, included in contractholder funds \| Discounted cash flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Liabilities, fair value	$ 3,115
FIA embedded derivatives, included in contractholder funds \| Discounted cash flow \| Market value of option \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
FIA/ IUL embedded derivatives, included in contractholder funds	0.0000	0.0000
FIA embedded derivatives, included in contractholder funds \| Discounted cash flow \| Market value of option \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
FIA/ IUL embedded derivatives, included in contractholder funds	0.2390	0.3872
FIA embedded derivatives, included in contractholder funds \| Discounted cash flow \| Market value of option \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
FIA/ IUL embedded derivatives, included in contractholder funds	0.0087	0.0316
FIA embedded derivatives, included in contractholder funds \| Discounted cash flow \| Swap rates \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
FIA/ IUL embedded derivatives, included in contractholder funds	0.0388	0.0005
FIA embedded derivatives, included in contractholder funds \| Discounted cash flow \| Swap rates \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
FIA/ IUL embedded derivatives, included in contractholder funds	0.0473	0.0194
FIA embedded derivatives, included in contractholder funds \| Discounted cash flow \| Swap rates \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
FIA/ IUL embedded derivatives, included in contractholder funds	0.0431	0.0100
FIA embedded derivatives, included in contractholder funds \| Discounted cash flow \| Mortality multiplier \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
FIA/ IUL embedded derivatives, included in contractholder funds	1.0000	1.0000
FIA embedded derivatives, included in contractholder funds \| Discounted cash flow \| Mortality multiplier \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
FIA/ IUL embedded derivatives, included in contractholder funds	1.0000	1.0000
FIA embedded derivatives, included in contractholder funds \| Discounted cash flow \| Mortality multiplier \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
FIA/ IUL embedded derivatives, included in contractholder funds	1.0000	1.0000
FIA embedded derivatives, included in contractholder funds \| Discounted cash flow \| Surrender rates \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
FIA/ IUL embedded derivatives, included in contractholder funds	0.0025	0.0025
FIA embedded derivatives, included in contractholder funds \| Discounted cash flow \| Surrender rates \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
FIA/ IUL embedded derivatives, included in contractholder funds	0.7000	0.7000
FIA embedded derivatives, included in contractholder funds \| Discounted cash flow \| Surrender rates \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
FIA/ IUL embedded derivatives, included in contractholder funds	0.0657	0.0626
FIA embedded derivatives, included in contractholder funds \| Discounted cash flow \| Partial withdrawals \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
FIA/ IUL embedded derivatives, included in contractholder funds	0.0200	0.0200
FIA embedded derivatives, included in contractholder funds \| Discounted cash flow \| Partial withdrawals \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
FIA/ IUL embedded derivatives, included in contractholder funds	0.2941	0.2326
FIA embedded derivatives, included in contractholder funds \| Discounted cash flow \| Partial withdrawals \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
FIA/ IUL embedded derivatives, included in contractholder funds	0.0273	0.0272
FIA embedded derivatives, included in contractholder funds \| Discounted cash flow \| Non-performance spread \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
FIA/ IUL embedded derivatives, included in contractholder funds	0.0048	0.0043
FIA embedded derivatives, included in contractholder funds \| Discounted cash flow \| Non-performance spread \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
FIA/ IUL embedded derivatives, included in contractholder funds	0.0144	0.0101
FIA embedded derivatives, included in contractholder funds \| Discounted cash flow \| Non-performance spread \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
FIA/ IUL embedded derivatives, included in contractholder funds	0.0130	0.0068
FIA embedded derivatives, included in contractholder funds \| Discounted cash flow \| Option cost \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
FIA/ IUL embedded derivatives, included in contractholder funds	0.0007	0.0007
FIA embedded derivatives, included in contractholder funds \| Discounted cash flow \| Option cost \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
FIA/ IUL embedded derivatives, included in contractholder funds	0.0497	0.0497
FIA embedded derivatives, included in contractholder funds \| Discounted cash flow \| Option cost \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
FIA/ IUL embedded derivatives, included in contractholder funds	0.0189	0.0183
FIA embedded derivatives, included in contractholder funds \| Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Liabilities, fair value		$ 3,883
Investment in affiliate \| Discounted cash flow \| Discount rate \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity securities	0.1110	0.1270
Investment in affiliate \| Discounted cash flow \| Discount rate \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity securities	0.1110	0.1270
Investment in affiliate \| Discounted cash flow \| Discount rate \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity securities	0.1110	0.1270
Asset-backed securities \| Broker-quoted
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value	$ 5,916	$ 3,844
Asset-backed securities \| Broker-quoted \| Broker quoted/Market Comparable \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	0.5285	0.5256
Asset-backed securities \| Broker-quoted \| Broker quoted/Market Comparable \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	1.1717	2.6070
Asset-backed securities \| Broker-quoted \| Broker quoted/Market Comparable \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	0.9418	0.9706
Asset-backed securities \| Third-Party Valuation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value	$ 347	$ 115
Asset-backed securities \| Third-Party Valuation \| Broker quoted/Market Comparable \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	0.4143	0.9302
Asset-backed securities \| Third-Party Valuation \| Broker quoted/Market Comparable \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	2.1050	1.0845
Asset-backed securities \| Third-Party Valuation \| Broker quoted/Market Comparable \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	0.6799	1.0495
Commercial mortgage-backed securities \| Broker-quoted
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value	$ 20	$ 24
Commercial mortgage-backed securities \| Broker-quoted \| Broker quoted/Market Comparable \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	1.0902	1.2670
Commercial mortgage-backed securities \| Broker-quoted \| Broker quoted/Market Comparable \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	1.0902	1.2670
Commercial mortgage-backed securities \| Broker-quoted \| Broker quoted/Market Comparable \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	1.0902	1.2670
Commercial mortgage-backed securities \| Third-Party Valuation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value	$ 17	$ 11
Commercial mortgage-backed securities \| Third-Party Valuation \| Broker quoted/Market Comparable \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	0.7466	0.9791
Commercial mortgage-backed securities \| Third-Party Valuation \| Broker quoted/Market Comparable \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	0.8848	0.9791
Commercial mortgage-backed securities \| Third-Party Valuation \| Broker quoted/Market Comparable \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	0.8274	0.9791
Corporates \| Broker-quoted
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value	$ 602	$ 380
Corporates \| Broker-quoted \| Broker quoted/Market Comparable \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	0.7916	0
Corporates \| Broker-quoted \| Broker quoted/Market Comparable \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	1.0253	1.0969
Corporates \| Broker-quoted \| Broker quoted/Market Comparable \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	0.9416	1.0091
Corporates \| Third-Party Valuation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value	$ 826	$ 741
Corporates \| Third-Party Valuation \| Broker quoted/Market Comparable \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	0	0.8571
Corporates \| Third-Party Valuation \| Broker quoted/Market Comparable \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	1.0496	1.1957
Corporates \| Third-Party Valuation \| Broker quoted/Market Comparable \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	0.8969	1.0772
Corporates \| Discounted cash flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value	$ 12	$ 14
Corporates \| Discounted cash flow \| Discount rate \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	0.4400	0.4400
Corporates \| Discounted cash flow \| Discount rate \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	1.0000	1.0000
Corporates \| Discounted cash flow \| Discount rate \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	0.7702	0.6200
Municipals \| Third-Party Valuation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value	$ 29	$ 43
Municipals \| Third-Party Valuation \| Broker quoted/Market Comparable \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	0.9395	1.3509
Municipals \| Third-Party Valuation \| Broker quoted/Market Comparable \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	0.9395	1.3509
Municipals \| Third-Party Valuation \| Broker quoted/Market Comparable \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	0.9395	1.3509
Residential mortgage-backed securities \| Broker-quoted
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value	$ 302
Residential mortgage-backed securities \| Broker-quoted \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	0.0000
Residential mortgage-backed securities \| Broker-quoted \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	0.9104
Residential mortgage-backed securities \| Broker-quoted \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	0.8638
Short term investments \| Broker-quoted
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value		$ 321
Short term investments \| Broker-quoted \| Broker quoted/Market Comparable \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Short term investments		1.0000
Short term investments \| Broker-quoted \| Broker quoted/Market Comparable \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Short term investments		1.0000
Short term investments \| Broker-quoted \| Broker quoted/Market Comparable \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Short term investments		1.0000
Foreign Governments \| Third-Party Valuation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value	$ 16	$ 18
Foreign Governments \| Third-Party Valuation \| Broker quoted/Market Comparable \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	0.9978	1.0723
Foreign Governments \| Third-Party Valuation \| Broker quoted/Market Comparable \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	1.0229	1.1644
Foreign Governments \| Third-Party Valuation \| Broker quoted/Market Comparable \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	1.0056	1.1011
Preferred securities \| Investment in affiliate \| Discounted cash flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value	$ 1
Preferred securities \| Investment in affiliate \| Discounted cash flow \| Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity securities	1.0000
Preferred securities \| Investment in affiliate \| Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value		$ 2
Preferred securities \| Investment in affiliate \| Income Approach \| Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity securities		0.0243
Equity securities \| Broker-quoted
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value	$ 6	$ 3
Equity securities \| Broker-quoted \| Broker quoted/Market Comparable \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity securities		6.23
Equity securities \| Broker-quoted \| Broker quoted/Market Comparable \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity securities		6.23
Equity securities \| Broker-quoted \| Broker quoted/Market Comparable \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity securities		6.23
Equity securities \| Broker-quoted \| EBITDA multiple \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity securities	5.6	5.9
Equity securities \| Broker-quoted \| EBITDA multiple \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity securities	5.6	5.9
Equity securities \| Broker-quoted \| EBITDA multiple \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity securities	5.6	5.9
Equity securities \| Investment in affiliate \| Broker-quoted \| Broker quoted/Market Comparable \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity securities	64.25
Equity securities \| Investment in affiliate \| Broker-quoted \| Broker quoted/Market Comparable \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity securities	64.25
Equity securities \| Investment in affiliate \| Broker-quoted \| Broker quoted/Market Comparable \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity securities	64.25
Equity securities \| Investment in affiliate \| Discounted cash flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value	$ 4	$ 4
Equity securities \| Investment in affiliate \| Black Scholes model
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value		$ 2
Equity securities \| Investment in affiliate \| Black Scholes model \| Risk Free Rate \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity securities		0.0100
Equity securities \| Investment in affiliate \| Black Scholes model \| Risk Free Rate \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity securities		0.0100
Equity securities \| Investment in affiliate \| Black Scholes model \| Risk Free Rate \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity securities		0.0100
Equity securities \| Investment in affiliate \| Black Scholes model \| Strike Price \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity securities		1.50
Equity securities \| Investment in affiliate \| Black Scholes model \| Strike Price \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity securities		1.50
Equity securities \| Investment in affiliate \| Black Scholes model \| Strike Price \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity securities		1.50
Equity securities \| Investment in affiliate \| Black Scholes model \| Volatility \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity securities		0.8100
Equity securities \| Investment in affiliate \| Black Scholes model \| Volatility \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity securities		0.8100
Equity securities \| Investment in affiliate \| Black Scholes model \| Volatility \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity securities		0.8100
Equity securities \| Investment in affiliate \| Black Scholes model \| Dividend Yield \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity securities		0.0000
Equity securities \| Investment in affiliate \| Black Scholes model \| Dividend Yield \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity securities		0.0000
Equity securities \| Investment in affiliate \| Black Scholes model \| Dividend Yield \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity securities		0.0000
Available-for-sale embedded derivative \| Black Scholes model \| Market value of fund
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Available-for-sale embedded derivative	1.0000	1.0000
Available-for-sale embedded derivative \| Investment in affiliate \| Discounted cash flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value	$ 23	$ 34
Secured borrowing receivable \| Broker-quoted
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value	$ 10
Secured borrowing receivable \| Broker-quoted \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other long-term investments	1.0000
Secured borrowing receivable \| Broker-quoted \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other long-term investments	1.0000
Secured borrowing receivable \| Broker-quoted \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other long-term investments	1.0000
Credit Linked Note \| Broker-quoted
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value	$ 15	$ 23
Credit Linked Note \| Broker-quoted \| Broker quoted/Market Comparable
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Credit Linked Note	0.9623
Credit Linked Note \| Investment in affiliate \| Broker-quoted \| Broker quoted/Market Comparable
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Credit Linked Note		1.0000
Investment in affiliate \| EBITDA multiple \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment in affiliate	5
Investment in affiliate \| EBITDA multiple \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment in affiliate	5.5
Investment in affiliate \| Broker-quoted \| EBITDA multiple \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment in affiliate		8
Investment in affiliate \| Broker-quoted \| EBITDA multiple \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment in affiliate		8
Investment in affiliate \| Investment in affiliate \| Discounted cash flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value	$ 23	$ 21

Fair Value of Financial Instruments - Quantitative Information of Unobservable Inputs Used for Level Three Fair Value Measurements of Financial Instruments on Recurring Basis (Detail)
$ in Millions