Investments - Investments, Level 3 Rollforward (Detail) - Investments [Member] - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Beginning Balance	$ 16,332	$ 17,916	$ 16,423	$ 15,282
Net realized gains/(losses)	78	128	184	238
Net unrealized gains/(losses)	155	534	1,244	(808)
Purchases	496	405	1,467	1,250
Sales	(478)	(269)	(1,070)	(1,379)
Settlements	(831)	(686)	(2,421)	(1,180)
Transfers into level 3	806	230	1,843	5,373
Transfers out of level 3	(2,879)	(984)	(3,991)	(1,502)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Ending Balance	13,679	17,274	13,679	17,274
Corporate debt securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Beginning Balance	4,958	6,572	5,286	3,465
Net realized gains/(losses)	33	48	150	115
Net unrealized gains/(losses)	47	142	302	(263)
Purchases	101	137	374	401
Sales	(204)	(22)	(383)	(215)
Settlements	(601)	(386)	(1,254)	(553)
Transfers into level 3	529	121	1,120	3,234
Transfers out of level 3	(586)	(761)	(1,318)	(333)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Ending Balance	4,277	5,851	4,277	5,851
Securities backed by real estate [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Beginning Balance	1,117	880	998	595
Net realized gains/(losses)	12	12	29	32
Net unrealized gains/(losses)	(11)	16	25	(97)
Purchases	14	35	212	124
Sales	(19)		(43)
Settlements	(51)	(11)	(247)	(43)
Transfers into level 3	26		114	323
Transfers out of level 3		(2)		(4)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Ending Balance	1,088	930	1,088	930
Equity Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Beginning Balance	9,755	10,035	9,642	10,903
Net realized gains/(losses)	29	64	(4)	81
Net unrealized gains/(losses)	118	373	916	(448)
Purchases	371	206	849	680
Sales	(254)	(245)	(641)	(1,160)
Settlements	(146)	(283)	(866)	(575)
Transfers into level 3	251	109	609	1,722
Transfers out of level 3	(2,197)	(221)	(2,578)	(1,165)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Ending Balance	7,927	10,038	7,927	10,038
Other debt obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Beginning Balance	502	429	497	319
Net realized gains/(losses)	4	4	9	10
Net unrealized gains/(losses)	1	3	1
Purchases	10	27	32	45
Sales	(1)	(2)	(3)	(4)
Settlements	(33)	(6)	(54)	(9)
Transfers into level 3				94
Transfers out of level 3	(96)		(95)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Ending Balance	$ 387	$ 455	$ 387	$ 455

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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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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-Name Accounting Standards Codification
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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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-Publisher FASB
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-Section 50
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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 settlement 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 level 3 of the fair value hierarchy.

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-Name Accounting Standards Codification
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Amount of transfers of financial instrument classified as an asset 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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