Commitments and Contingencies - Tax Credits and Amortization (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2025	Mar. 31, 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 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 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 for income taxes
Investment Program, Proportional Amortization Method, Applied, Amortization Expense, Statement of Income or Comprehensive Income [Extensible Enumeration]	Provision 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	$ 211	$ 185
Amortization and other changes in carrying amount:	188	171
Other Community Development Investment
Income Tax Contingency [Line Items]
Amortization and other changes in carrying amount:	$ 2	$ 2

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- Definition

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.

+ References

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Amount of amortization expense for investment that generates income tax credit and other income tax benefit under tax credit program accounted for using proportional amortization method.

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Indicates line item in statement of cash flows that includes amortization expense for investment that generates income tax credit and other income tax benefit under tax credit program accounted for using proportional amortization method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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