Reinsurance (Reinsurance amounts recorded on the Consolidated Statement of Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reinsurance [Abstract]
Direct insurance premiums and fee income									$ 13,807	$ 14,028	$ 13,159
Reinsurance assumed									102	97	101
Reinsurance ceded									(2,285)	(2,136)	(2,018)
Total insurance premiums and fee income									11,624	11,989	11,242
Direct insurance benefits									14,982	10,578	10,497
Reinsurance recoveries netted against benefits									(4,181)	(2,539)	(2,447)
Total benefits	$ 2,053	$ 4,498	$ 2,051	$ 2,199	$ 2,169	$ 1,839	$ 1,848	$ 2,183	$ 10,801	$ 8,039	$ 8,050