Commitments and Contingencies - Tax Credits and Amortization (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Income Tax Contingency [Line Items]
Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization, Statement of Cash Flows [Extensible Enumeration]			Provision (benefit) for income taxes
Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization, Statement of Cash Flows [Extensible Enumeration]			Provision (benefit) for income taxes
Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization, Statement of Cash Flows [Extensible Enumeration]			Provision (benefit) for income taxes
Investment Program, Proportional Amortization Method, Applied, Amortization Expense, Statement of Income or Comprehensive Income [Extensible Enumeration]			Provision (benefit) for income taxes
Investments in affordable housing projects
Income Tax Contingency [Line Items]
Investments in affordable housing projects, other qualified tax credits, and other community development investments	$ 209	$ 185	$ 420	$ 370
Amortization and other changes in carrying amount:	186	170	374	341
Other Community Development Investment
Income Tax Contingency [Line Items]
Amortization and other changes in carrying amount:	$ 3	$ 3	$ 5	$ 5

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Amount, before amortization expense, of income tax credit and other tax benefit generated by investment under tax credit program elected to be accounted for using proportional amortization method. Includes, but is not limited to, investment under tax credit program not meeting condition for accounting under proportional amortization method.

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