Other Assets - Tax Credit Investments Expenses and Related Income Tax Credits and Other Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Other Assets [Abstract]
Proportional amortization recognized in tax provision	$ (233)	$ (193)	$ (185)
Investment Program, Proportional Amortization Method, Applied, Amortization Expense, Statement of Income or Comprehensive Income [Extensible Enumeration]	Income tax provision	Income tax provision	Income tax provision
Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization, Statement of Income or Comprehensive Income [Extensible Enumeration]	Income tax provision	Income tax provision	Income tax provision
Income tax credits and Other income tax benefits (a) recognized in tax provision	$ 276	$ 221	$ 204