Variable Interest Entities - Tax Credit VIEs (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Variable Interest Entity [Line Items]
Investments in qualified affordable housing projects	$ 3,343		$ 3,343		$ 3,456
Commitments related to qualified affordable housing projects	1,960		1,960		2,150
Investment in qualified affordable housing projects, amortization	89	$ 96	348	$ 315
Tax credits related to qualified affordable housing projects	115	$ 117	447	$ 382
Investments in credit funds measured at NAV	$ 129,176		$ 129,176		$ 104,742
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 $190 and $194 at fair value)		Other assets (includes $190 and $194 at fair value)		Other assets (includes $190 and $194 at fair value)
Renewable Energy Projects
Variable Interest Entity [Line Items]
Investments in credit funds measured at NAV	$ 1,230		$ 1,230		$ 1,390

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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