Non-U.S. Activities - Schedule of Results from Non-U.S. Operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information [Line Items]
Total revenue	$ 2,691	$ 2,959	$ 8,902	$ 8,993
Income before income tax expense	511	849	2,115	2,438
Non-U.S.
Segment Reporting Information [Line Items]
Total revenue	1,081	1,232	3,777	3,912
Income before income tax expense	130	333	819	1,089
U.S.
Segment Reporting Information [Line Items]
Total revenue	1,610	1,727	5,125	5,081
Income before income tax expense	$ 381	$ 516	$ 1,296	$ 1,349