Insurance (Guarantees Related to Annuity Contracts) (Details) - Variable Annuity Guarantees - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Guaranteed Death Benefits
Net Amount at Risk by Product and Guarantee [Line Items]
Total account value (3)	$ 105,784	$ 104,075
Separate account value	101,108	99,257
Net amount at risk	$ 6,315	$ 6,392
Average attained age of contract holders	71 years	70 years
At Annuitization
Net Amount at Risk by Product and Guarantee [Line Items]
Total account value (3)	$ 56,966	$ 57,790
Separate account value	55,910	56,668
Net amount at risk	$ 4,992	$ 6,341
Average attained age of contract holders	71 years	70 years