Non-U.S. Activities - Schedule of Results from Non-U.S. Operations (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting Information [Line Items]
Total revenue	$ 2,953	$ 3,034	$ 6,034	$ 5,984
Income before income tax expense	835	938	1,589	1,565
Non-U.S.
Segment Reporting Information [Line Items]
Total revenue	1,336	1,325	2,715	2,670
Income before income tax expense	407	396	772	733
U.S.
Segment Reporting Information [Line Items]
Total revenue	1,617	1,709	3,319	3,314
Income before income tax expense	$ 428	$ 542	$ 817	$ 832