Variable Interest Entities - Tax Credits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Variable Interest Entity [Line Items]
Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, after Amortization, Statement of Cash Flows [Extensible Enumeration]	Income tax expense
Investment Program, Proportional Amortization Method, Applied, Amortization Expense, Statement of Income or Comprehensive Income [Extensible Enumeration]	Income tax expense
Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, after Amortization, Statement of Cash Flows [Extensible Enumeration]	Income tax expense
Income recorded in total revenue	$ 13,000	$ 11,945	$ 12,148
VIE - not primary beneficiary
Variable Interest Entity [Line Items]
Income recorded in total revenue	29	26
Tax credits and benefits recognized in income tax expense	256	239
Proportional amortization recognized in income tax expense	(207)	(182)
Total income tax expense (benefit)	49	57
Net benefit attributable to tax-advantaged investments included in the consolidated statement of income for which proportional amortization has been elected	$ 78	$ 83