Non-U.S. Activities - Schedule Of Results From Non-U.S. Operations (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Total revenue	$ 3,065	$ 2,932
Income before income taxes	774	635
Non-U.S.
Segment Reporting Information [Line Items]
Total revenue	1,364	1,335
Income before income taxes	285	300
U.S.
Segment Reporting Information [Line Items]
Total revenue	1,701	1,597
Income before income taxes	$ 489	$ 335