Non-U.S. Activities - Schedule Of Results From Non-U.S. Operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Total revenue	$ 2,784	$ 2,903	$ 8,786	$ 8,708
Income before income taxes	681	721	2,258	2,074
Non-U.S.
Segment Reporting Information [Line Items]
Total revenue	1,297	1,296	3,939	3,920
Income before income taxes	292	347	862	963
U.S.
Segment Reporting Information [Line Items]
Total revenue	1,487	1,607	4,847	4,788
Income before income taxes	$ 389	$ 374	$ 1,396	$ 1,111