Fair Value Measurements - Changes in level 3 recurring fair value measurements, liabilities (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Liabilities:
Fair Value Beginning of Period	$ 3,494	$ 14,427	$ 3,494	$ 14,427	$ 6,044	$ 15,176	$ 14,011	$ 15,721
Net Realized and Unrealized (Gains) Losses Included in Income	(2,583)	262	(11,424)	(1,085)
Other Comprehensive Income (Loss)	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net	27	153	(182)	(255)
Gross Transfers In	0	0		0
Gross Transfers Out	6	1	5	46
Other	0	0	0	0
Fair Value End of Period	3,494	14,427	3,494	14,427
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period	2,698	706	12,212	3,829
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period	0	0	0	0
Policyholder contract deposits
Liabilities:
Fair Value Beginning of Period	6,348	9,273	6,348	9,273	6,957	9,682	9,020	9,798
Net Realized and Unrealized (Gains) Losses Included in Income	(936)	(26)	(4,055)	(923)
Other Comprehensive Income (Loss)	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net	327	279	721	398
Gross Transfers In	0	0	0	0
Gross Transfers Out	0	0	0	0
Other	0	0	0	0
Fair Value End of Period	6,348	9,273	6,348	9,273
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period	949	362	4,302	1,914
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period	0	0	0	0
Derivative liabilities, net
Liabilities:
Net Realized and Unrealized (Gains) Losses Included in Income	110	79	482	(45)
Purchases, Sales, Issuances and Settlements, Net	(190)	(33)	(327)	(161)
Derivative liabilities, net:
Fair Value Beginning of Period	(275)	(326)	(428)	(119)
Net Realized and Unrealized (Gains) Losses Included in Income	110	79	482	(45)
Other Comprehensive Income (Loss)	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net	(190)	(33)	(327)	(161)
Gross Transfers In	0	0	(81)	0
Gross Transfers Out	6	1	5	46
Other	0	0	0	0
Fair Value End of Period	(349)	(279)	(349)	(279)
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period	(42)	(70)	(197)	(2)
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period	0	0	0	0
Interest rate contracts
Derivative liabilities, net:
Fair Value Beginning of Period	(143)	(1)	0	0
Net Realized and Unrealized (Gains) Losses Included in Income	37	(2)	48	(4)
Other Comprehensive Income (Loss)	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net	(110)	2	(183)	3
Gross Transfers In	0	0	(81)	0
Gross Transfers Out	6	0	6	0
Other	0	0	0	0
Fair Value End of Period	(210)	(1)	(210)	(1)
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period	30	2	27	4
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period	0	0	0	0
Foreign exchange contracts
Derivative liabilities, net:
Fair Value Beginning of Period	1	(1)	(1)	(2)
Net Realized and Unrealized (Gains) Losses Included in Income	0	(1)	1	0
Other Comprehensive Income (Loss)	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net	0	1	1	1
Gross Transfers In	0	0	0	0
Gross Transfers Out	0	0	0	0
Other	0	0	0	0
Fair Value End of Period	1	(1)	1	(1)
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period	0	1	(1)	0
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period	0	0	0	0
Equity contracts
Derivative liabilities, net:
Fair Value Beginning of Period	(149)	(357)	(444)	(151)
Net Realized and Unrealized (Gains) Losses Included in Income	88	99	478	2
Other Comprehensive Income (Loss)	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net	(94)	(50)	(188)	(204)
Gross Transfers In	0	0	0	0
Gross Transfers Out	0	1	(1)	46
Other	0	0	0	0
Fair Value End of Period	(155)	(307)	(155)	(307)
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period	(89)	(90)	(272)	(58)
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period	0	0	0	0
Credit contracts
Derivative liabilities, net:
Fair Value Beginning of Period	32	43	30	42
Net Realized and Unrealized (Gains) Losses Included in Income	1	0	3	7
Other Comprehensive Income (Loss)	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net	(2)	(2)	(2)	(8)
Gross Transfers In	0	0	0	0
Gross Transfers Out	0	0	0	0
Other	0	0	0	0
Fair Value End of Period	31	41	31	41
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period	0	1	0	2
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period	0	0	0	0
Other contracts
Derivative liabilities, net:
Fair Value Beginning of Period	(16)	(10)	(13)	(8)
Net Realized and Unrealized (Gains) Losses Included in Income	(16)	(17)	(48)	(50)
Other Comprehensive Income (Loss)	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net	16	16	45	47
Gross Transfers In	0	0	0	0
Gross Transfers Out	0	0	0	0
Other	0	0	0	0
Fair Value End of Period	(16)	(11)	(16)	(11)
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period	17	16	49	50
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period	0	0	0	0
Fortitude Re funds withheld payable
Liabilities:
Fair Value Beginning of Period	(2,505)	5,433	(2,505)	5,433	$ (638)	$ 5,922	$ 5,317	$ 6,042
Net Realized and Unrealized (Gains) Losses Included in Income	(1,757)	209	(7,851)	(117)
Other Comprehensive Income (Loss)	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net	(110)	(93)	(576)	(492)
Gross Transfers In	0	0	0	0
Gross Transfers Out	0	0	0	0
Other	0	0	0	0
Fair Value End of Period	(2,505)	5,433	(2,505)	5,433
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period	1,791	414	8,107	1,917
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period	$ 0	$ 0	$ 0	$ 0