Insurance (Guarantees Related to Annuity Contracts) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Variable Annuity Guarantees: | Guaranteed Death Benefits
Net Amount at Risk by Product and Guarantee [Line Items]
Total account value	$ 56,925	$ 62,281
Separate account value (1)	37,883	42,043
Net amount at risk	$ 2,562	$ 1,490
Average attained age of contractholders	69 years	68 years
Variable Annuity Guarantees: | Guaranteed Annuitization Benefits
Net Amount at Risk by Product and Guarantee [Line Items]
Total account value	$ 20,994	$ 23,121
Separate account value (1)	19,452	21,508
Net amount at risk	$ 549	$ 500
Average attained age of contractholders	68 years	66 years
Other Annuity Guarantees: | Guaranteed Annuitization Benefits
Net Amount at Risk by Product and Guarantee [Line Items]
Total account value	$ 4,750	$ 5,002
Net amount at risk	$ 193	$ 196
Average attained age of contractholders	56 years	56 years