Contracts Accounted for as Insurance - BIG Transaction Loss Summary (Details) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2024 USD ($) risk	Dec. 31, 2023 USD ($) risk
Discount
Total	$ 71
BIG
Number of risks
Total (in contracts) | risk	212	217
Principal
Total	$ 5,468	$ 5,383
BIG | BIG 1
Number of risks
Total (in contracts) | risk	90	95
Principal
Total	$ 2,159	$ 2,394
BIG | BIG 2
Number of risks
Total (in contracts) | risk	14	13
Principal
Total	$ 1,526	$ 979
BIG | BIG 3
Number of risks
Total (in contracts) | risk	108	109
Principal
Total	$ 1,783	$ 2,010
BIG | Consolidated Entity Excluding Variable Interest Entities (VIE)
Number of risks
Total (in contracts) | risk	212	217
Remaining weighted average contract period
Gross (in years)	10 years 2 months 12 days	9 years 10 months 24 days
Total (in years)	10 years 3 months 18 days	10 years
Principal
Gross	$ 5,483	$ 5,398
Total	5,468	5,383
Interest
Gross	2,986	2,840
Total	2,983	2,836
Total net outstanding exposure
Gross	8,469	8,238
Total	8,451	8,219
Expected cash outflows (inflows)
Gross	1,981	1,948
Total	1,971	1,938
Potential recoveries
Gross	(1,852)	(1,668)
Total	(1,842)	(1,659)
Subtotal
Gross	129	280
Total	129	279
Discount
Gross	71	(19)
Total	71	(19)
Expected losses to be paid (recovered)
Gross	200	261
Net expected loss to be paid	200	260
Deferred premium revenue
Gross	293	305
Total	293	305
Reserves (salvage)
Gross	(4)	73
Total	$ (4)	$ 72
BIG | Consolidated Entity Excluding Variable Interest Entities (VIE) | BIG 1
Number of risks
Total (in contracts) | risk	90	95
Remaining weighted average contract period
Gross (in years)	11 years 1 month 6 days	9 years 7 months 6 days
Principal
Gross	$ 2,165	$ 2,400
Interest
Gross	1,146	1,126
Total net outstanding exposure
Gross	3,311	3,526
Expected cash outflows (inflows)
Gross	101	176
Potential recoveries
Gross	(275)	(376)
Subtotal
Gross	(174)	(200)
Discount
Gross	38	56
Expected losses to be paid (recovered)
Gross	(136)	(144)
Deferred premium revenue
Gross	65	100
Reserves (salvage)
Gross	$ (172)	$ (181)
BIG | Consolidated Entity Excluding Variable Interest Entities (VIE) | BIG 2
Number of risks
Total (in contracts) | risk	14	13
Remaining weighted average contract period
Gross (in years)	13 years	15 years 10 months 24 days
Principal
Gross	$ 1,526	$ 979
Interest
Gross	1,201	896
Total net outstanding exposure
Gross	2,727	1,875
Expected cash outflows (inflows)
Gross	410	187
Potential recoveries
Gross	(336)	(78)
Subtotal
Gross	74	109
Discount
Gross	42	(22)
Expected losses to be paid (recovered)
Gross	116	87
Deferred premium revenue
Gross	98	63
Reserves (salvage)
Gross	$ 48	$ 45
BIG | Consolidated Entity Excluding Variable Interest Entities (VIE) | BIG 3
Number of risks
Total (in contracts) | risk	108	109
Remaining weighted average contract period
Gross (in years)	6 years 8 months 12 days	7 years 6 months
Principal
Gross	$ 1,792	$ 2,019
Interest
Gross	639	818
Total net outstanding exposure
Gross	2,431	2,837
Expected cash outflows (inflows)
Gross	1,470	1,585
Potential recoveries
Gross	(1,241)	(1,214)
Subtotal
Gross	229	371
Discount
Gross	(9)	(53)
Expected losses to be paid (recovered)
Gross	220	318
Deferred premium revenue
Gross	130	142
Reserves (salvage)
Gross	$ 120	$ 209