Other Assets - Schedule of Proportional Amortization Investment (Details) - USD ($) |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Other Assets [Abstract] | ||||
| Tax credits and other tax benefits from proportional amortization investments | $ 90,000,000 | $ 102,000,000 | $ 169,000,000 | $ 158,000,000 |
| Investment amortization expense recognized as a component of income tax expense | 71,000,000 | 80,000,000 | 133,000,000 | 125,000,000 |
| Net benefit from proportional amortization investments | $ 19,000,000 | $ 22,000,000 | $ 36,000,000 | $ 33,000,000 |
| 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 (Benefit) | Income Tax Expense (Benefit) | Income Tax Expense (Benefit) | Income Tax Expense (Benefit) |
| 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 (Benefit) | Income Tax Expense (Benefit) | Income Tax Expense (Benefit) | Income Tax Expense (Benefit) |
| Investment Program, Proportional Amortization Method, Applied, Amortization Expense, Statement of Income or Comprehensive Income [Extensible Enumeration] | Income Tax Expense (Benefit) | Income Tax Expense (Benefit) | Income Tax Expense (Benefit) | Income Tax Expense (Benefit) |
| 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 |