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, 2023 USD ($)	Dec. 31, 2022 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value	$ 1,312	$ 1,112
Liabilities, fair value	4,661	3,397
Valuation, Market Approach \| Broker quoted/Market Comparable
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value	8,365	7,174
FIA embedded derivatives, included in contractholder funds \| Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Liabilities, fair value	$ 4,258	$ 3,115
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	0.0683	0.0657
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	0.3448	0.2941
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	0.0274	0.0273
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	0.0038	0.0048
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	0.0110	0.0144
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	0.0096	0.0130
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	0.1893	0.2390
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	0.0263	0.0087
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 \| 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	0.0548	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	0.0238	0.0189
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	0.0384	0.0388
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	0.0526	0.0473
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	0.0455	0.0431
Asset-backed securities \| Third-Party Valuation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value	$ 57	$ 91
Asset-backed securities \| Third-Party Valuation \| Discount rate \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	0.0509	0.0523
Asset-backed securities \| Third-Party Valuation \| Discount rate \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	0.0695	0.0898
Asset-backed securities \| Third-Party Valuation \| Discount rate \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	0.0600	0.0607
Corporates \| Third-Party Valuation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value	$ 787	$ 796
Corporates \| Third-Party Valuation \| Discount rate \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	0.0000	0.0475
Corporates \| Third-Party Valuation \| Discount rate \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	0.1287	0.1245
Corporates \| Third-Party Valuation \| Discount rate \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	0.0691	0.0722
Corporates \| Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value	$ 8	$ 12
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	0.7520	0.7702
States, municipalities and political subdivisions \| Third-Party Valuation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value	$ 32	$ 29
States, municipalities and political subdivisions \| Third-Party Valuation \| Discount rate \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	0.0625	0.0762
States, municipalities and political subdivisions \| Third-Party Valuation \| Discount rate \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	0.0625	0.0762
States, municipalities and political subdivisions \| Third-Party Valuation \| Discount rate \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	0.0625	0.0762
Residential mortgage-backed securities \| Third-Party Valuation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value	$ 3
Residential mortgage-backed securities \| Third-Party Valuation \| Discount rate \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	0.0546
Residential mortgage-backed securities \| Third-Party Valuation \| Discount rate \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	0.0546
Residential mortgage-backed securities \| Third-Party Valuation \| Discount rate \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	0.0546
Foreign Governments \| Third-Party Valuation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value	$ 16	$ 16
Foreign Governments \| Third-Party Valuation \| Discount rate \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	0.0694	0.0599
Foreign Governments \| Third-Party Valuation \| Discount rate \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	0.0768	0.0628
Foreign Governments \| Third-Party Valuation \| Discount rate \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities	0.0745	0.0619
Investment in unconsolidated affiliates \| Valuation, Market Approach \| EBITDA multiple \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity Method Investment, Measurement Input	4.4
Investment in unconsolidated affiliates \| Valuation, Market Approach \| EBITDA multiple \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity Method Investment, Measurement Input	31.8
Investment in unconsolidated affiliates \| Valuation, Market Approach \| EBITDA multiple \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity Method Investment, Measurement Input	23.2
Investment in unconsolidated affiliates \| Affiliate \| Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value	$ 285	$ 23
Investment in unconsolidated affiliates \| Affiliate \| Valuation, Market Approach \| EBITDA multiple \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment in unconsolidated affiliates		5
Investment in unconsolidated affiliates \| Affiliate \| Valuation, Market Approach \| EBITDA multiple \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment in unconsolidated affiliates		5.50
Preferred securities \| Affiliate \| Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value	$ 1	$ 1
Preferred securities \| Affiliate \| Discounted Cash Flow \| Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity/ Preferred securities	1.0000	1.0000
Equity securities \| Affiliate \| Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value	$ 7	$ 4
Equity securities \| Affiliate \| Discounted Cash Flow \| Discount rate \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity/ Preferred securities	0.1150	0.1110
Equity securities \| Affiliate \| Discounted Cash Flow \| Discount rate \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity/ Preferred securities	0.1150	0.1110
Equity securities \| Affiliate \| Discounted Cash Flow \| Discount rate \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity/ Preferred securities	0.1150	0.1110
Available-for-sale embedded derivative \| Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value	$ 28	$ 23
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
Market risk benefits asset \| Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets, fair value	$ 88	$ 117
Market risk benefits asset \| Discounted Cash Flow \| Mortality \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	1.0000	1.0000
Market risk benefits asset \| Discounted Cash Flow \| Mortality \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	1.0000	1.0000
Market risk benefits asset \| Discounted Cash Flow \| Mortality \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	1.0000	1.0000
Market risk benefits asset \| Discounted Cash Flow \| Surrender Rates \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	0.0025	0.0025
Market risk benefits asset \| Discounted Cash Flow \| Surrender Rates \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	0.1000	0.1000
Market risk benefits asset \| Discounted Cash Flow \| Surrender Rates \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	0.0522	0.0469
Market risk benefits asset \| Discounted Cash Flow \| Partial Withdrawals \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	0	0.0200
Market risk benefits asset \| Discounted Cash Flow \| Partial Withdrawals \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	0.2326	0.2174
Market risk benefits asset \| Discounted Cash Flow \| Partial Withdrawals \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	0.0250	0.0249
Market risk benefits asset \| Discounted Cash Flow \| Non-Performance Spread \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	0.0038	0.0048
Market risk benefits asset \| Discounted Cash Flow \| Non-Performance Spread \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	0.0110	0.0144
Market risk benefits asset \| Discounted Cash Flow \| Non-Performance Spread \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	0.0096	0.0130
Market risk benefits asset \| Discounted Cash Flow \| GMWB Utilization \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	0.5000	0.5000
Market risk benefits asset \| Discounted Cash Flow \| GMWB Utilization \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	0.6000	0.6000
Market risk benefits asset \| Discounted Cash Flow \| GMWB Utilization \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	0.5081	0.5094
Market Risk benefits liability \| Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Liabilities, fair value	$ 403	$ 282
Market Risk benefits liability \| Discounted Cash Flow \| Mortality \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	1.0000	1.0000
Market Risk benefits liability \| Discounted Cash Flow \| Mortality \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	1.0000	1.0000
Market Risk benefits liability \| Discounted Cash Flow \| Mortality \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	1.0000	1.0000
Market Risk benefits liability \| Discounted Cash Flow \| Surrender Rates \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	0.0025	0.0025
Market Risk benefits liability \| Discounted Cash Flow \| Surrender Rates \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	0.1000	0.1000
Market Risk benefits liability \| Discounted Cash Flow \| Surrender Rates \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	0.0522	0.0469
Market Risk benefits liability \| Discounted Cash Flow \| Partial Withdrawals \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	0	0.0200
Market Risk benefits liability \| Discounted Cash Flow \| Partial Withdrawals \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	0.2326	0.2174
Market Risk benefits liability \| Discounted Cash Flow \| Partial Withdrawals \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	0.0250	0.0249
Market Risk benefits liability \| Discounted Cash Flow \| Non-Performance Spread \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	0.0038	0.0048
Market Risk benefits liability \| Discounted Cash Flow \| Non-Performance Spread \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	0.0110	0.0144
Market Risk benefits liability \| Discounted Cash Flow \| Non-Performance Spread \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	0.0096	0.0130
Market Risk benefits liability \| Discounted Cash Flow \| GMWB Utilization \| Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	0.5000	0.5000
Market Risk benefits liability \| Discounted Cash Flow \| GMWB Utilization \| Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	0.6000	0.6000
Market Risk benefits liability \| Discounted Cash Flow \| GMWB Utilization \| Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Market risk benefit	0.5081	0.5094

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