Non-U.S. Activities - Schedule Of Results From Non-U.S. Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Total revenue	$ 11,703	$ 11,756	$ 12,131
Income before income taxes	2,899	2,712	3,101
Non-U.S.
Segment Reporting Information [Line Items]
Total revenue	5,252	5,230	5,190
Income before income taxes	1,146	1,248	1,294
U.S.
Segment Reporting Information [Line Items]
Total revenue	6,451	6,526	6,941
Income before income taxes	$ 1,753	$ 1,464	$ 1,807