Non-U.S. Activities - Schedule Of Results From Non-U.S. Operations (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Total revenue	$ 3,034	$ 2,937	$ 5,984	$ 6,002
Income before income taxes	938	803	1,565	1,577
Non-U.S.
Segment Reporting Information [Line Items]
Total revenue	1,319	1,268	2,655	2,625
Income before income taxes	376	339	699	678
U.S.
Segment Reporting Information [Line Items]
Total revenue	1,715	1,669	3,329	3,377
Income before income taxes	$ 562	$ 464	$ 866	$ 899