Non-U.S. Activities - Schedule Of Results From Non-U.S. Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total revenue	$ 11,982	$ 11,170	$ 10,207
Income before income taxes	2,999	2,899	2,120
Non-U.S.
Segment Reporting Information [Line Items]
Total revenue	5,178	4,734	4,419
Income before income taxes	1,664	1,230	1,047
U.S.
Segment Reporting Information [Line Items]
Total revenue	6,804	6,436	5,788
Income before income taxes	$ 1,335	$ 1,669	$ 1,073