Non-U.S. Activities - Schedule Of Results From Non-U.S. Operations (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Total revenue	$ 2,937	$ 2,873	$ 6,002	$ 5,805
Income before income taxes	803	718	1,577	1,353
Non-U.S.
Segment Reporting Information [Line Items]
Total revenue	1,269	1,290	2,629	2,623
Income before income taxes	244	314	514	616
U.S.
Segment Reporting Information [Line Items]
Total revenue	1,668	1,583	3,373	3,182
Income before income taxes	$ 559	$ 404	$ 1,063	$ 737