Non-U.S. Activities - Schedule of Results from Non-U.S. Operations (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting Information [Line Items]
Total revenue	$ 3,191	$ 3,110	$ 6,329	$ 6,211
Income before income tax expense	912	916	1,510	1,604
Non-U.S.
Segment Reporting Information [Line Items]
Total revenue	1,388	1,400	2,732	2,696
Income before income tax expense	351	433	642	692
U.S.
Segment Reporting Information [Line Items]
Total revenue	1,803	1,710	3,597	3,515
Income before income tax expense	$ 561	$ 483	$ 868	$ 912