Non-U.S. Activities - Schedule of Results from Non-U.S. Operations (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Segment Reporting Information [Line Items]
Total revenue	$ 3,796	$ 3,284
Income before income tax expense	969	822
Non-U.S.
Segment Reporting Information [Line Items]
Total revenue	1,676	1,382
Income before income tax expense	454	309
U.S.
Segment Reporting Information [Line Items]
Total revenue	2,120	1,902
Income before income tax expense	$ 515	$ 513