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Fair Value of Financial Instruments - Changes to Fair Value of Financial Instruments Level 3 (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Abstract]
Balance at Beginning of Period	$ 5,600	$ 3,267
Assets, Total Gains (Losses) Included in Earnings	(17)	15
Assets, Total Gains (Losses) Included in AOCI	(602)	(48)
Assets, Purchases	4,321	4,449
Assets, Sales	(62)	(120)
Assets, Settlements	(760)	(1,449)
Assets, Net transfer In (Out) of Level 3	(311)	(514)
Balance at End of Period	8,169	5,600
Change in Unrealized Included in OCI	(632)	59
Liabilities, Fair Value Disclosure [Abstract]
Balance at Beginning of Period	3,883	3,409
Liabilities, Total Gains (Losses) Included in Earnings	(1,382)	121
Liabilities, Total Gains (Losses) Included in AOCI	0	0
Liabilities, Purchases	768	513
Liabilities, Sales	0	(4)
Liabilities, Settlements	(154)	156
Liabilities, Net transfer In (Out) of Level 3	0	0
Balance at End of Period	3,115	3,883
Change in Unrealized Incl in OCI	$ 0	0
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Recognized gains and losses, net
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration]	Unrealized (loss) gain on investments and other financial instruments, net of adjustments to intangible assets and unearned revenue (excluding investments in unconsolidated affiliates)
Future policy benefits
Liabilities, Fair Value Disclosure [Abstract]
Balance at Beginning of Period	$ 0	5
Liabilities, Total Gains (Losses) Included in Earnings	0	0
Liabilities, Total Gains (Losses) Included in AOCI	0	0
Liabilities, Purchases	0	0
Liabilities, Sales	0	(4)
Liabilities, Settlements	0	1
Liabilities, Net transfer In (Out) of Level 3	0	0
Balance at End of Period	0	0
Change in Unrealized Incl in OCI	0	0
FIA embedded derivatives, included in contractholder funds
Liabilities, Fair Value Disclosure [Abstract]
Balance at Beginning of Period	3,883	3,404
Liabilities, Total Gains (Losses) Included in Earnings	(1,382)	121
Liabilities, Total Gains (Losses) Included in AOCI	0	0
Liabilities, Purchases	768	513
Liabilities, Sales	0	0
Liabilities, Settlements	(154)	155
Liabilities, Net transfer In (Out) of Level 3	0	0
Balance at End of Period	3,115	3,883
Change in Unrealized Incl in OCI	0	0
Asset-backed securities
Debt Securities, Available-for-sale [Abstract]
Balance at Beginning of Period	3,959	1,350
Assets, Total Gains (Losses) Included in Earnings	(6)	(1)
Assets, Total Gains (Losses) Included in AOCI	(393)	(8)
Assets, Purchases	3,269	3,417
Assets, Sales	(39)	(97)
Assets, Settlements	(541)	(595)
Assets, Net transfer In (Out) of Level 3	14	(107)
Balance at End of Period	6,263	3,959
Change in Unrealized Included in OCI	(426)	4
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Abstract]
Balance at Beginning of Period	35	26
Assets, Total Gains (Losses) Included in Earnings	0	0
Assets, Total Gains (Losses) Included in AOCI	(5)	(3)
Assets, Purchases	0	12
Assets, Sales	0	0
Assets, Settlements	0	0
Assets, Net transfer In (Out) of Level 3	7	0
Balance at End of Period	37	35
Change in Unrealized Included in OCI	(4)	1
Corporates
Debt Securities, Available-for-sale [Abstract]
Balance at Beginning of Period	1,135	1,289
Assets, Total Gains (Losses) Included in Earnings	1	8
Assets, Total Gains (Losses) Included in AOCI	(187)	(40)
Assets, Purchases	714	161
Assets, Sales	(20)	(23)
Assets, Settlements	(215)	(247)
Assets, Net transfer In (Out) of Level 3	12	(13)
Balance at End of Period	1,440	1,135
Change in Unrealized Included in OCI	(188)	23
Hybrids
Debt Securities, Available-for-sale [Abstract]
Balance at Beginning of Period	0	4
Assets, Total Gains (Losses) Included in Earnings	0	0
Assets, Total Gains (Losses) Included in AOCI	0	0
Assets, Purchases	0	0
Assets, Sales	0	0
Assets, Settlements	0	(4)
Assets, Net transfer In (Out) of Level 3	0	0
Balance at End of Period	0	0
Change in Unrealized Included in OCI	0	0
Municipals
Debt Securities, Available-for-sale [Abstract]
Balance at Beginning of Period	43	43
Assets, Total Gains (Losses) Included in Earnings	0	0
Assets, Total Gains (Losses) Included in AOCI	(14)	0
Assets, Purchases	0	0
Assets, Sales	0	0
Assets, Settlements	0	0
Assets, Net transfer In (Out) of Level 3	0	0
Balance at End of Period	29	43
Change in Unrealized Included in OCI	(13)	7
Residential mortgage-backed securities
Debt Securities, Available-for-sale [Abstract]
Balance at Beginning of Period	0	483
Assets, Total Gains (Losses) Included in Earnings	0	0
Assets, Total Gains (Losses) Included in AOCI	0	(1)
Assets, Purchases	316	14
Assets, Sales	0	0
Assets, Settlements	0	(102)
Assets, Net transfer In (Out) of Level 3	(14)	(394)
Balance at End of Period	302	0
Change in Unrealized Included in OCI	0	22
Foreign Governments
Debt Securities, Available-for-sale [Abstract]
Balance at Beginning of Period	18	17
Assets, Total Gains (Losses) Included in Earnings	0	0
Assets, Total Gains (Losses) Included in AOCI	(2)	1
Assets, Purchases	0	0
Assets, Sales	0	0
Assets, Settlements	0	0
Assets, Net transfer In (Out) of Level 3	0	0
Balance at End of Period	16	18
Change in Unrealized Included in OCI	(1)	2
Short-term
Debt Securities, Available-for-sale [Abstract]
Balance at Beginning of Period	321	0
Assets, Total Gains (Losses) Included in Earnings	0	0
Assets, Total Gains (Losses) Included in AOCI	(1)	2
Assets, Purchases	20	820
Assets, Sales	0	0
Assets, Settlements	0	(501)
Assets, Net transfer In (Out) of Level 3	(340)	0
Balance at End of Period	0	321
Change in Unrealized Included in OCI	(1)	0
Preferred securities
Debt Securities, Available-for-sale [Abstract]
Balance at Beginning of Period	2	1
Assets, Total Gains (Losses) Included in Earnings	0	(1)
Assets, Total Gains (Losses) Included in AOCI	(1)	1
Assets, Purchases	0	1
Assets, Sales	0	0
Assets, Settlements	0	0
Assets, Net transfer In (Out) of Level 3	0	0
Balance at End of Period	1	2
Change in Unrealized Included in OCI	(1)	0
Equity securities
Debt Securities, Available-for-sale [Abstract]
Balance at Beginning of Period	9	4
Assets, Total Gains (Losses) Included in Earnings	0	2
Assets, Total Gains (Losses) Included in AOCI	0	0
Assets, Purchases	2	3
Assets, Sales	(1)	0
Assets, Settlements	0	0
Assets, Net transfer In (Out) of Level 3	0	0
Balance at End of Period	10	9
Change in Unrealized Included in OCI	0	0
Available-for-sale embedded derivative
Debt Securities, Available-for-sale [Abstract]
Balance at Beginning of Period	34	27
Assets, Total Gains (Losses) Included in Earnings	(11)	7
Assets, Total Gains (Losses) Included in AOCI	0	0
Assets, Purchases	0	0
Assets, Sales	0	0
Assets, Settlements	0	0
Assets, Net transfer In (Out) of Level 3	0	0
Balance at End of Period	23	34
Change in Unrealized Included in OCI	0	0
Credit linked note
Debt Securities, Available-for-sale [Abstract]
Balance at Beginning of Period	23
Assets, Total Gains (Losses) Included in Earnings	(1)
Assets, Total Gains (Losses) Included in AOCI	(1)
Assets, Purchases	0
Assets, Sales	(2)
Assets, Settlements	(4)
Assets, Net transfer In (Out) of Level 3	0
Balance at End of Period	15	23
Change in Unrealized Included in OCI	0
Credit linked note | Investment in affiliate
Debt Securities, Available-for-sale [Abstract]
Balance at Beginning of Period	23	23
Assets, Total Gains (Losses) Included in Earnings		0
Assets, Total Gains (Losses) Included in AOCI		0
Assets, Purchases		0
Assets, Sales		0
Assets, Settlements		0
Assets, Net transfer In (Out) of Level 3		0
Balance at End of Period		23
Change in Unrealized Included in OCI		0
Investment in affiliate | Investment in affiliate
Debt Securities, Available-for-sale [Abstract]
Balance at Beginning of Period	21	0
Assets, Total Gains (Losses) Included in Earnings	0	0
Assets, Total Gains (Losses) Included in AOCI	2	0
Assets, Purchases	0	21
Assets, Sales	0	0
Assets, Settlements	0	0
Assets, Net transfer In (Out) of Level 3	0	0
Balance at End of Period	23	21
Change in Unrealized Included in OCI	2	0
Secured borrowing receivable
Debt Securities, Available-for-sale [Abstract]
Balance at Beginning of Period	0
Assets, Total Gains (Losses) Included in Earnings	0
Assets, Total Gains (Losses) Included in AOCI	0
Assets, Purchases	0
Assets, Sales	0
Assets, Settlements	0
Assets, Net transfer In (Out) of Level 3	10
Balance at End of Period	10	$ 0
Change in Unrealized Included in OCI	$ 0

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