Insurance (Guarantees Related to Annuity Contracts) (Details) - Variable Annuity Guarantees - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Guaranteed Death Benefits
Net Amount at Risk by Product and Guarantee [Line Items]
Total account value (3)	$ 96,960	$ 105,784
Separate account value	92,277	101,108
Net amount at risk	$ 9,189	$ 6,315
Average attained age of contract holders	72 years	71 years
Guaranteed Annuitization Benefits
Net Amount at Risk by Product and Guarantee [Line Items]
Total account value (3)	$ 51,769	$ 56,966
Separate account value	50,709	55,910
Net amount at risk	$ 5,468	$ 4,992
Average attained age of contract holders	71 years	71 years