Non-U.S. Activities - Schedule Of Results From Non-U.S. Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Total revenue	$ 11,756	$ 12,131	$ 11,266
Income before income taxes	2,712	3,101	2,995
Non-U.S.
Segment Reporting Information [Line Items]
Total revenue	4,974	5,190	4,734
Income before income taxes	1,159	1,294	1,230
U.S.
Segment Reporting Information [Line Items]
Total revenue	6,782	6,941	6,532
Income before income taxes	$ 1,553	$ 1,807	$ 1,765