Insurance (Guarantees Related to Universal and Variable Life Contracts) (Details) - Secondary Guarantees - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Universal Life Contracts
Net Amount at Risk by Product and Guarantee [Line Items]
Total account value (3)	$ 5,242	$ 5,518
Net amount at risk	$ 65,473	$ 67,248
Average attained age of policyholders	69 years	68 years
Variable Life Contracts
Net Amount at Risk by Product and Guarantee [Line Items]
Total account value (3)	$ 1,169	$ 1,448
Net amount at risk	$ 10,149	$ 10,508
Average attained age of policyholders	48 years	47 years