Non-U.S. Activities - Schedule of Results from Non-U.S. Operations (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting Information [Line Items]
Total revenue	$ 3,284	$ 3,138
Income before income tax expense	822	598
Non-U.S.
Segment Reporting Information [Line Items]
Total revenue	1,382	1,344
Income before income tax expense	309	279
U.S.
Segment Reporting Information [Line Items]
Total revenue	1,902	1,794
Income before income tax expense	$ 513	$ 319