Non-U.S. Activities - Schedule Of Results From Non-U.S. Operations (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Total revenue	$ 2,950	$ 3,065
Income before income taxes	627	774
Non-U.S.
Segment Reporting Information [Line Items]
Total revenue	1,337	1,357
Income before income taxes	312	339
U.S.
Segment Reporting Information [Line Items]
Total revenue	1,613	1,708
Income before income taxes	$ 315	$ 435