Variable Interest Entities - Tax Credit VIEs (Details) - USD ($)	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Variable Interest Entity [Line Items]
Investments in qualified affordable housing projects	$ 4,209,000,000		$ 4,209,000,000		$ 4,123,000,000
Commitments related to qualified affordable housing projects	2,600,000,000		2,600,000,000		2,570,000,000
Investment in qualified affordable housing projects, amortization	142,000,000	$ 128,000,000	243,000,000	$ 259,000,000
Tax credits related to qualified affordable housing projects	178,000,000	$ 164,000,000	308,000,000	$ 332,000,000
Investment program proportional amortization method, that do not meet criteria			0		0
Investments in credit funds measured at NAV	$ 179,979,000,000		$ 179,979,000,000		$ 124,182,000,000
Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization, Statement of Income or Comprehensive Income [Extensible Enumeration]			Provision for taxes	Provision for taxes
Investment Program, Proportional Amortization Method, Applied, Amortization Expense, Statement of Income or Comprehensive Income [Extensible Enumeration]			Provision for taxes	Provision for taxes
Investment Program, Proportional Amortization Method, Applied, Amortization Expense, Statement of Cash Flows [Extensible Enumeration]			Increase (Decrease) in Other Operating Assets and Liabilities, Net	Increase (Decrease) in Other Operating Assets and Liabilities, Net
Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization, Statement of Cash Flows [Extensible Enumeration]			Increase (Decrease) in Other Operating Assets and Liabilities, Net	Increase (Decrease) in Other Operating Assets and Liabilities, Net
Investment, Proportional Amortization Method, Elected, Statement of Financial Position [Extensible Enumeration]	Other assets (includes $202 and $180 at fair value)		Other assets (includes $202 and $180 at fair value)		Other assets (includes $202 and $180 at fair value)
Renewable Energy Projects
Variable Interest Entity [Line Items]
Investments in credit funds measured at NAV	$ 1,050,000,000.00		$ 1,050,000,000.00		$ 1,170,000,000

Investment Program Proportional Amortization Method, That Do Not Meet Criteria

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

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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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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Amount of commitment and contingent commitment, including amount of delayed equity contribution, for investment that generates income tax credit and other income tax benefit under tax credit program elected to be accounted for using proportional amortization method. Includes, but is not limited to, commitment and contingent commitment related to investment under tax credit program not meeting condition for accounting under proportional amortization method.

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