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Commitments and Contingencies - Tax Credits and Amortization (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Income Tax Contingency [Line Items] |  |  |  |
Investment Program Proportional Amortization Method, Elected Income Tax Credit And Other Income Tax Benefit Before Amortization Statement Of Cash Flows, Extensible Enumeration, Not Disclosed Flag |  |  | Investments in affordable housing projects, other qualified tax credits, and other community development investments(1) | Investments in affordable housing projects, other qualified tax credits, and other community development investments(1)
Investment Program Proportional Amortization Method Applied Income Tax Credit And Other Tax Benefit Amortization Statement Of Cash Flows Extensible Enumeration Not Disclosed Flag |  |  | Investments in affordable housing projects and other qualified tax credits | Investments in affordable housing projects and other qualified tax credits
Amortization Method Applied Income Tax Credit And Other Tax Benefit Amortization Statement Of Cash Flows Extensible Enumeration Not Disclosed Flag |  |  | Investments in affordable housing projects and other qualified tax credits | Investments in affordable housing projects and other qualified tax credits
Investments in affordable housing projects |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Investments in affordable housing projects, other qualified tax credits, and other community development investments | $ 232 | $ 209 | $ 457 | $ 420
Investments in affordable housing projects and other qualified tax credits | 202 | 186 | $ 402 | $ 374
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)
Investment Program, Proportional Amortization Method, Applied, Amortization Expense, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  | Income Tax Expense (Benefit) | Income Tax Expense (Benefit)
Other Community Development Investment |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Other community development investments | $ 2 | $ 3 | $ 4 | $ 5

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