Non-U.S. Activities - Schedule Of Results From Non-U.S. Operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Total revenue	$ 2,990	$ 2,784	$ 8,974	$ 8,786
Income before income tax expense	876	681	2,441	2,258
Non-U.S.
Segment Reporting Information [Line Items]
Total revenue	1,331	1,268	3,987	3,894
Income before income tax expense	387	325	1,095	1,002
U.S.
Segment Reporting Information [Line Items]
Total revenue	1,659	1,516	4,987	4,892
Income before income tax expense	$ 489	$ 356	$ 1,346	$ 1,256