Investments - Investments, Level 3 Rollforward (Detail) - Investments [Member] - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 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	$ 17,049	$ 19,408	$ 16,423	$ 15,282
Net realized gains/(losses)	85	40	245	121
Net unrealized gains/(losses)	1,106	(135)	1,894	(1,395)
Purchases	558	344	971	811
Sales	(422)	(110)	(778)	(1,186)
Settlements	(1,174)	(192)	(1,734)	(504)
Transfers into level 3	873	428	1,522	5,937
Transfers out of level 3	(1,743)	(1,867)	(2,211)	(1,150)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Ending Balance	16,332	17,916	16,332	17,916
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	5,314	7,149	5,286	3,465
Net realized gains/(losses)	25	27	127	78
Net unrealized gains/(losses)	179	35	295	(406)
Purchases	27	181	215	244
Sales	(155)	(33)	(281)	(209)
Settlements	(437)	(72)	(678)	(226)
Transfers into level 3	506	87	844	3,800
Transfers out of level 3	(501)	(802)	(850)	(174)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Ending Balance	4,958	6,572	4,958	6,572
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	1,039	775	998	595
Net realized gains/(losses)	13	7	27	17
Net unrealized gains/(losses)	36	(28)	36	(104)
Purchases	168	7	208	94
Settlements	(111)	(26)	(211)	(43)
Transfers into level 3		159	87	321
Transfers out of level 3	(28)	(14)	(28)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Ending Balance	1,117	880	1,117	880
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	10,173	11,056	9,642	10,903
Net realized gains/(losses)	43	2	83	19
Net unrealized gains/(losses)	888	(143)	1,561	(902)
Purchases	352	142	509	469
Sales	(256)	(62)	(485)	(977)
Settlements	(598)	(91)	(813)	(226)
Transfers into level 3	367	182	591	1,725
Transfers out of level 3	(1,214)	(1,051)	(1,333)	(976)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Ending Balance	9,755	10,035	9,755	10,035
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	523	428	497	319
Net realized gains/(losses)	4	4	8	7
Net unrealized gains/(losses)	3	1	2	17
Purchases	11	14	39	4
Sales	(11)	(15)	(12)
Settlements	(28)	(3)	(32)	(9)
Transfers into level 3				91
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Ending Balance	$ 502	$ 429	$ 502	$ 429

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=117815213&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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-Publisher FASB
-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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