Insurance (Guarantees Related to Universal and Variable Life Contracts) (Details) - Secondary Guarantees - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Universal Life Contracts
Net Amount at Risk by Product and Guarantee [Line Items]
Total account value (3)	$ 5,518	$ 5,772
Net amount at risk	$ 67,248	$ 69,083
Average attained age of policyholders	68 years	67 years
Variable Life Contracts
Net Amount at Risk by Product and Guarantee [Line Items]
Total account value (3)	$ 1,448	$ 1,306
Net amount at risk	$ 10,508	$ 11,234
Average attained age of policyholders	47 years	46 years