v3.26.1
Variable Interest Entities - Tax Credit VIEs (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Variable Interest Entity [Line Items]      
Investments in qualified affordable housing projects $ 4,060   $ 4,123
Commitments related to qualified affordable housing projects 2,490   2,570
Investment in qualified affordable housing projects, amortization 101 $ 131  
Tax credits related to qualified affordable housing projects 130 $ 168  
Investment program proportional amortization method, that do not meet criteria 116   0
Investments in credit funds measured at NAV $ 161,762   $ 124,182
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 $192 and $180 at fair value)   Other assets (includes $192 and $180 at fair value)
Renewable Energy Projects      
Variable Interest Entity [Line Items]      
Investments in credit funds measured at NAV $ 1,110   $ 1,170