Insurance (Guarantees) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Movement In Guaranteed Benefit Liability Gross Rollforward
Balance at January 1,	$ 12,450	$ 10,261	$ 9,166
Incurred guaranteed benefits	972	2,461	1,184
Paid guaranteed benefits	(352)	(272)	(89)
Balance at December 31,	13,070	12,450	10,261
Variable Annuity Guarantees | In the Event Death
Movement In Guaranteed Benefit Liability Gross Rollforward
Balance at January 1,	1,621	1,596	1,543
Incurred guaranteed benefits	294	128	142
Paid guaranteed benefits	(77)	(103)	(89)
Balance at December 31,	1,838	1,621	1,596
Variable Annuity Guarantees | Guaranteed Minimum Income Benefit
Movement In Guaranteed Benefit Liability Gross Rollforward
Balance at January 1,	4,165	3,076	2,908
Incurred guaranteed benefits	(8)	1,089	168
Paid guaranteed benefits	0	0	0
Balance at December 31,	4,157	4,165	3,076
Universal and Variable Life Contracts | Secondary Guarantees
Movement In Guaranteed Benefit Liability Gross Rollforward
Balance at January 1,	6,664	5,589	4,715
Incurred guaranteed benefits	686	1,244	874
Paid guaranteed benefits	(275)	(169)	0
Balance at December 31,	7,075	6,664	5,589
Net Ceded and Assumed Liabilities For Guarantees
Movement In Guaranteed Benefit Liability Gross Rollforward
Paid guaranteed benefits	(114)	(140)	(87)
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Net	1,116	1,053	1,017	$ 902
Liabilities for Guarantees on long duration contracts reinsurance recoverable incurred benefits net	177	176	202
Net Ceded and Assumed Liabilities For Guarantees | Secondary Guarantees
Movement In Guaranteed Benefit Liability Gross Rollforward
Paid guaranteed benefits	(39)	(39)	0
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Net	1,207	1,146	1,083	964
Liabilities for Guarantees on long duration contracts reinsurance recoverable incurred benefits net	100	102	119
Net Ceded and Assumed Liabilities For Guarantees | In the Event Death
Movement In Guaranteed Benefit Liability Gross Rollforward
Paid guaranteed benefits	(75)	(101)	(87)
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Net	(26)	(21)	(15)	(12)
Liabilities for Guarantees on long duration contracts reinsurance recoverable incurred benefits net	70	95	84
Net Ceded and Assumed Liabilities For Guarantees | Guaranteed Minimum Income Benefit
Movement In Guaranteed Benefit Liability Gross Rollforward
Paid guaranteed benefits	0	0	0
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Net	(65)	(72)	(51)	(50)
Liabilities for Guarantees on long duration contracts reinsurance recoverable incurred benefits net	7	(21)	(1)
Net Liabilities For Guarantees
Movement In Guaranteed Benefit Liability Gross Rollforward
Incurred guaranteed benefits	795	2,285	982
Paid guaranteed benefits	(238)	(132)	(2)
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Net	11,954	11,397	9,244	8,264
Net Liabilities For Guarantees | Secondary Guarantees
Movement In Guaranteed Benefit Liability Gross Rollforward
Incurred guaranteed benefits	586	1,142	755
Paid guaranteed benefits	(236)	(130)	0
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Net	5,868	5,518	4,506	3,751
Net Liabilities For Guarantees | In the Event Death
Movement In Guaranteed Benefit Liability Gross Rollforward
Incurred guaranteed benefits	224	33	58
Paid guaranteed benefits	(2)	(2)	(2)
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Net	1,864	1,642	1,611	1,555
Net Liabilities For Guarantees | Guaranteed Minimum Income Benefit
Movement In Guaranteed Benefit Liability Gross Rollforward
Incurred guaranteed benefits	(15)	1,110	169
Paid guaranteed benefits	0	0	0
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Net	$ 4,222	$ 4,237	$ 3,127	$ 2,958