Variable Interest Entities - Tax Credits (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Variable Interest Entity [Line Items]
Total revenue	$ 3,191	$ 3,110	$ 6,329	$ 6,211
Net benefits included in income tax expense	201	$ 153	336	$ 292
VIE - not primary beneficiary
Variable Interest Entity [Line Items]
Total revenue	8		12
Tax credits and benefits recognized in income tax expense	71		127
Proportional amortization recognized in income tax expense	(55)		(99)
Net benefits included in income tax expense	16		28
Net benefit attributable to tax-advantaged investments included in the consolidated statement of income	$ 24		$ 40