Fair Value of Financial Instruments - Changes to Fair Value of Financial Instruments Level 3 (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022
Liabilities, Fair Value Disclosure [Abstract]
Balance at End of Period	$ 4,258
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Recognized gains and losses, net	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 gain (loss) on investments and other financial instruments, net of adjustments to intangible assets and unearned revenue (excluding investments in unconsolidated affiliates)	Unrealized gain (loss) on investments and other financial instruments, net of adjustments to intangible assets and unearned revenue (excluding investments in unconsolidated affiliates)
Level 3
Debt Securities, Available-for-sale [Abstract]
Balance at Beginning of Period	$ 8,286	$ 5,641
Balance at End of Period	9,677	8,286
Liabilities, Fair Value Disclosure [Abstract]
Balance at Beginning of Period	3,397	4,352
Balance at End of Period	4,661	3,397
FIA embedded derivatives, included in contractholder funds
Liabilities, Fair Value Disclosure [Abstract]
Balance at Beginning of Period	3,115	3,883
Liabilities, Total Gains (Losses) Included in Earnings	257	(1,382)
Liabilities, Total Gains (Losses) Included in AOCI	0	0
Liabilities, Purchases	1,049	768
Liabilities, Sales	0	0
Liabilities, Settlements	(163)	(154)
Liabilities, Net transfer In (Out) of Level 3	0	0
Balance at End of Period	4,258	3,115
Change in Unrealized Incl in OCI	0	0
Derivative investments
Debt Securities, Available-for-sale [Abstract]
Balance at Beginning of Period	0
Assets, Total Gains (Losses) Included in Earnings	57
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	57	0
Change in Unrealized Included in OCI	0
Asset-backed securities
Debt Securities, Available-for-sale [Abstract]
Balance at Beginning of Period	6,263	3,959
Assets, Total Gains (Losses) Included in Earnings	(53)	(6)
Assets, Total Gains (Losses) Included in AOCI	186	(393)
Assets, Purchases	1,830	3,269
Assets, Sales	(125)	(39)
Assets, Settlements	(738)	(541)
Assets, Net transfer In (Out) of Level 3	(241)	14
Balance at End of Period	7,122	6,263
Change in Unrealized Included in OCI	185	(426)
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Abstract]
Balance at Beginning of Period	37	35
Assets, Total Gains (Losses) Included in Earnings	0	0
Assets, Total Gains (Losses) Included in AOCI	2	(5)
Assets, Purchases	22	0
Assets, Sales	0	0
Assets, Settlements	0	0
Assets, Net transfer In (Out) of Level 3	(43)	7
Balance at End of Period	18	37
Change in Unrealized Included in OCI	2	(4)
Corporates
Debt Securities, Available-for-sale [Abstract]
Balance at Beginning of Period	1,440	1,135
Assets, Total Gains (Losses) Included in Earnings	(2)	1
Assets, Total Gains (Losses) Included in AOCI	(21)	(187)
Assets, Purchases	654	714
Assets, Sales	(1)	(20)
Assets, Settlements	(94)	(215)
Assets, Net transfer In (Out) of Level 3	3	12
Balance at End of Period	1,979	1,440
Change in Unrealized Included in OCI	(20)	(188)
Hybrids
Debt Securities, Available-for-sale [Abstract]
Balance at Beginning of Period	0	0
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	0
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	29	43
Assets, Total Gains (Losses) Included in Earnings	0	0
Assets, Total Gains (Losses) Included in AOCI	20	(14)
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	49	29
Change in Unrealized Included in OCI	20	(13)
Residential mortgage-backed securities
Debt Securities, Available-for-sale [Abstract]
Balance at Beginning of Period	302	0
Assets, Total Gains (Losses) Included in Earnings	1	0
Assets, Total Gains (Losses) Included in AOCI	7	0
Assets, Purchases	32	316
Assets, Sales	0	0
Assets, Settlements	(9)	0
Assets, Net transfer In (Out) of Level 3	(330)	(14)
Balance at End of Period	3	302
Change in Unrealized Included in OCI	7	0
Foreign Governments
Debt Securities, Available-for-sale [Abstract]
Balance at Beginning of Period	16	18
Assets, Total Gains (Losses) Included in Earnings	0	0
Assets, Total Gains (Losses) Included in AOCI	0	(2)
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	16
Change in Unrealized Included in OCI	0	(1)
Investment in unconsolidated affiliates
Debt Securities, Available-for-sale [Abstract]
Balance at Beginning of Period	23	21
Assets, Total Gains (Losses) Included in Earnings	13	0
Assets, Total Gains (Losses) Included in AOCI	0	2
Assets, Purchases	249	0
Assets, Sales	0	0
Assets, Settlements	0	0
Assets, Net transfer In (Out) of Level 3	0	0
Balance at End of Period	285	23
Change in Unrealized Included in OCI	0	2
Short-term
Debt Securities, Available-for-sale [Abstract]
Balance at Beginning of Period	0	321
Assets, Total Gains (Losses) Included in Earnings	0	0
Assets, Total Gains (Losses) Included in AOCI	0	(1)
Assets, Purchases	204	20
Assets, Sales	(19)	0
Assets, Settlements	(185)	0
Assets, Net transfer In (Out) of Level 3	0	(340)
Balance at End of Period	0	0
Change in Unrealized Included in OCI	0	(1)
Preferred securities
Debt Securities, Available-for-sale [Abstract]
Balance at Beginning of Period	1	2
Assets, Total Gains (Losses) Included in Earnings	0	0
Assets, Total Gains (Losses) Included in AOCI	0	(1)
Assets, Purchases	0	0
Assets, Sales	0	0
Assets, Settlements	0	0
Assets, Net transfer In (Out) of Level 3	7	0
Balance at End of Period	8	1
Change in Unrealized Included in OCI	1	(1)
Equity securities
Debt Securities, Available-for-sale [Abstract]
Balance at Beginning of Period	10	9
Assets, Total Gains (Losses) Included in Earnings	1	0
Assets, Total Gains (Losses) Included in AOCI	1	0
Assets, Purchases	0	2
Assets, Sales	0	(1)
Assets, Settlements	0	0
Assets, Net transfer In (Out) of Level 3	3	0
Balance at End of Period	15	10
Change in Unrealized Included in OCI	0	0
Available-for-sale embedded derivative
Debt Securities, Available-for-sale [Abstract]
Balance at Beginning of Period	23	34
Assets, Total Gains (Losses) Included in Earnings	0	(11)
Assets, Total Gains (Losses) Included in AOCI	4	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	27	23
Change in Unrealized Included in OCI	4	0
Credit linked note
Debt Securities, Available-for-sale [Abstract]
Balance at Beginning of Period	15	23
Assets, Total Gains (Losses) Included in Earnings	0	(1)
Assets, Total Gains (Losses) Included in AOCI	0	(1)
Assets, Purchases	0	0
Assets, Sales	0	(2)
Assets, Settlements	(5)	(4)
Assets, Net transfer In (Out) of Level 3	0	0
Balance at End of Period	10	15
Change in Unrealized Included in OCI	0	0
Secured borrowing receivable
Debt Securities, Available-for-sale [Abstract]
Balance at Beginning of Period	10	0
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	(10)	0
Assets, Net transfer In (Out) of Level 3	0	10
Balance at End of Period	0	10
Change in Unrealized Included in OCI	0	0
Subtotal Level 3 assets at fair value
Debt Securities, Available-for-sale [Abstract]
Balance at Beginning of Period	8,169	5,600
Assets, Total Gains (Losses) Included in Earnings		(17)
Assets, Total Gains (Losses) Included in AOCI		(602)
Assets, Purchases		4,321
Assets, Sales		(62)
Assets, Settlements		(760)
Assets, Net transfer In (Out) of Level 3		(311)
Balance at End of Period		8,169
Change in Unrealized Included in OCI		(632)
Subtotal Level 3 assets at fair value \| Level 3
Debt Securities, Available-for-sale [Abstract]
Balance at Beginning of Period	8,169
Assets, Total Gains (Losses) Included in Earnings	17
Assets, Total Gains (Losses) Included in AOCI	199
Assets, Purchases	2,991
Assets, Sales	(145)
Assets, Settlements	(1,041)
Assets, Net transfer In (Out) of Level 3	(601)
Balance at End of Period	9,589	8,169
Change in Unrealized Included in OCI	199
Market risk benefits asset \| Level 3
Debt Securities, Available-for-sale [Abstract]
Balance at Beginning of Period	117	41
Balance at End of Period	88	117
Subtotal Level 3 liabilities at fair value
Liabilities, Fair Value Disclosure [Abstract]
Balance at Beginning of Period	3,115	3,883
Liabilities, Total Gains (Losses) Included in Earnings	257	(1,382)
Liabilities, Total Gains (Losses) Included in AOCI	0	0
Liabilities, Purchases	1,049	768
Liabilities, Sales	0	0
Liabilities, Settlements	(163)	(154)
Liabilities, Net transfer In (Out) of Level 3	0	0
Balance at End of Period		3,115
Change in Unrealized Incl in OCI		0
Subtotal Level 3 liabilities at fair value \| Level 3
Liabilities, Fair Value Disclosure [Abstract]
Balance at Beginning of Period	3,115
Balance at End of Period		3,115
Change in Unrealized Incl in OCI	0
Market Risk benefits liability \| Level 3
Liabilities, Fair Value Disclosure [Abstract]
Balance at Beginning of Period	282	469
Balance at End of Period	$ 403	$ 282

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Amount of unrealized gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3) and still held.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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Amount of unrealized gain (loss) recognized in other comprehensive income (OCI) from liability measured at fair value on recurring basis using unobservable input (level 3) and still held.

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Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy.

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Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3).

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Amount of gain (loss) recognized in other comprehensive income (OCI) from liability measured at fair value on recurring basis using unobservable input (level 3).

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Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of transfers of financial instrument classified as a liability into (out of) level 3 of the fair value hierarchy.

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Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Indicates line item in statement in which other comprehensive income (OCI) is reported that includes gain (loss) from asset measured at fair value using unobservable input (level 3).

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