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Other Assets - Schedule of Proportional Amortization Investment (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Other Assets [Abstract]        
Tax credits and other tax benefits from proportional amortization investments $ 91,000,000 $ 106,000,000 $ 249,000,000 $ 215,000,000
Investment amortization expense recognized as a component of income tax expense 73,000,000 86,000,000 198,000,000 174,000,000
Net benefit from proportional amortization investments $ 18,000,000 $ 20,000,000 $ 51,000,000 $ 41,000,000
Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization, Statement of Income or Comprehensive Income [Extensible Enumeration] Income tax expense from continuing operations Income tax expense from continuing operations Income tax expense from continuing operations Income tax expense from continuing operations
Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, after Amortization, Statement of Income or Comprehensive Income [Extensible Enumeration] Income tax expense from continuing operations Income tax expense from continuing operations Income tax expense from continuing operations Income tax expense from continuing operations
Investment Program, Proportional Amortization Method, Applied, Amortization Expense, Statement of Income or Comprehensive Income [Extensible Enumeration] Income tax expense from continuing operations Income tax expense from continuing operations Income tax expense from continuing operations Income tax expense from continuing operations
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 Deferred Income Taxes, Increase (Decrease) in Other Operating Assets, Other liabilities Increase (Decrease) in Deferred Income Taxes, Increase (Decrease) in Other Operating Assets, Other liabilities Increase (Decrease) in Deferred Income Taxes, Increase (Decrease) in Other Operating Assets, Other liabilities Increase (Decrease) in Deferred Income Taxes, Increase (Decrease) in Other Operating Assets, Other liabilities
Investment Program, Proportional Amortization Method, Applied, Amortization Expense, Statement of Cash Flows [Extensible Enumeration] Increase (Decrease) in Deferred Income Taxes, Increase (Decrease) in Other Operating Assets, Other liabilities Increase (Decrease) in Deferred Income Taxes, Increase (Decrease) in Other Operating Assets, Other liabilities Increase (Decrease) in Deferred Income Taxes, Increase (Decrease) in Other Operating Assets, Other liabilities Increase (Decrease) in Deferred Income Taxes, Increase (Decrease) in Other Operating Assets, Other liabilities
Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, after Amortization, Statement of Cash Flows [Extensible Enumeration] Increase (Decrease) in Deferred Income Taxes, Increase (Decrease) in Other Operating Assets, Other liabilities Increase (Decrease) in Deferred Income Taxes, Increase (Decrease) in Other Operating Assets, Other liabilities Increase (Decrease) in Deferred Income Taxes, Increase (Decrease) in Other Operating Assets, Other liabilities Increase (Decrease) in Deferred Income Taxes, Increase (Decrease) in Other Operating Assets, Other liabilities
Investment program, proportional amortization method, elected, impairment loss $ 0 $ 0 $ 0 $ 0