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Fair Values of Assets and Liabilities - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Jun. 30, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Available-for-sale securities | [1] | $ 89,065 |  |  | $ 85,992 |  |
Mortgage loans held for sale |  | 2,288 |  |  | 2,251 |  |
Mortgage servicing rights |  | 3,289 | $ 3,187 | $ 3,305 | 3,369 | $ 3,326 | $ 3,377
Derivative assets netting |  | (3,282) |  |  | (2,979) |  |
Time deposits |  | 4,924 |  |  | 5,754 |  |
Long-term debt |  | 1,408 |  |  | 391 |  |
Derivative liabilities netting |  | (3,838) |  |  | (2,949) |  |
Equity investments without readily determinable fair values |  | 173 |  |  | 159 |  |
Equity investments without readily determinable fair values impairment loss |  | 0 | $ 0 |  |  |  |
U.S. Treasury and agencies |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Available-for-sale securities |  | 27,068 |  |  | 28,387 |  |
Residential mortgage-backed securities | Agency |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Available-for-sale securities |  | 37,677 |  |  | 33,281 |  |
Commercial mortgage-backed securities | Agency |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Available-for-sale securities |  | 7,694 |  |  | 7,351 |  |
Commercial mortgage-backed securities | Non-agency |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Available-for-sale securities |  | 7 |  |  | 6 |  |
Asset-backed securities |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Available-for-sale securities |  | 6,865 |  |  | 7,165 |  |
Obligations of state and political subdivisions |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Available-for-sale securities |  | 9,486 |  |  | 9,552 |  |
Other |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Available-for-sale securities |  | 268 |  |  | 250 |  |
Fair Value, Measurements, Recurring |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Available-for-sale securities |  | 89,065 |  |  | 85,992 |  |
Mortgage loans held for sale |  | 2,288 |  |  | 2,251 |  |
Mortgage servicing rights |  | 3,289 |  |  | 3,369 |  |
Derivative assets netting |  | (3,282) |  |  | (2,979) |  |
Derivative assets |  | 3,690 |  |  | 3,458 |  |
Other assets |  | 3,137 |  |  | 2,189 |  |
Total assets |  | 101,469 |  |  | 97,259 |  |
Time deposits |  | 4,924 |  |  | 5,754 |  |
Long-term debt |  | 1,408 |  |  | 391 |  |
Derivative liabilities netting |  | (3,838) |  |  | (2,949) |  |
Derivative liabilities |  | 3,131 |  |  | 5,211 |  |
Short-term borrowings and other liabilities |  | 2,592 |  |  | 1,935 |  |
Total liabilities |  | 12,055 |  |  | 13,291 |  |
Fair Value, Measurements, Recurring | U.S. Treasury and agencies |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Available-for-sale securities |  | 27,068 |  |  | 28,387 |  |
Fair Value, Measurements, Recurring | Residential mortgage-backed securities |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Available-for-sale securities |  | 37,677 |  |  | 33,281 |  |
Fair Value, Measurements, Recurring | Commercial mortgage-backed securities | Agency |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Available-for-sale securities |  | 7,694 |  |  | 7,351 |  |
Fair Value, Measurements, Recurring | Commercial mortgage-backed securities | Non-agency |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Available-for-sale securities |  | 7 |  |  | 6 |  |
Fair Value, Measurements, Recurring | Asset-backed securities |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Available-for-sale securities |  | 6,865 |  |  | 7,165 |  |
Fair Value, Measurements, Recurring | Obligations of state and political subdivisions |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Available-for-sale securities |  | 9,486 |  |  | 9,552 |  |
Fair Value, Measurements, Recurring | Other |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Available-for-sale securities |  | 268 |  |  | 250 |  |
Fair Value, Measurements, Recurring | Level 1 |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Available-for-sale securities |  | 22,355 |  |  | 23,891 |  |
Mortgage loans held for sale |  | 0 |  |  | 0 |  |
Mortgage servicing rights |  | 0 |  |  | 0 |  |
Derivative assets before netting |  | 92 |  |  | 27 |  |
Other assets |  | 412 |  |  | 420 |  |
Total assets |  | 22,859 |  |  | 24,338 |  |
Time deposits |  | 0 |  |  | 0 |  |
Long-term debt |  | 0 |  |  | 0 |  |
Derivative liabilities before netting |  | 82 |  |  | 27 |  |
Short-term borrowings and other liabilities |  | 752 |  |  | 475 |  |
Total liabilities |  | 834 |  |  | 502 |  |
Fair Value, Measurements, Recurring | Level 1 | U.S. Treasury and agencies |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Available-for-sale securities |  | 22,355 |  |  | 23,891 |  |
Fair Value, Measurements, Recurring | Level 1 | Residential mortgage-backed securities |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Available-for-sale securities |  | 0 |  |  | 0 |  |
Fair Value, Measurements, Recurring | Level 1 | Commercial mortgage-backed securities | Agency |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Available-for-sale securities |  | 0 |  |  | 0 |  |
Fair Value, Measurements, Recurring | Level 1 | Commercial mortgage-backed securities | Non-agency |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Available-for-sale securities |  | 0 |  |  | 0 |  |
Fair Value, Measurements, Recurring | Level 1 | Asset-backed securities |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Available-for-sale securities |  | 0 |  |  | 0 |  |
Fair Value, Measurements, Recurring | Level 1 | Obligations of state and political subdivisions |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Available-for-sale securities |  | 0 |  |  | 0 |  |
Fair Value, Measurements, Recurring | Level 1 | Other |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Available-for-sale securities |  | 0 |  |  | 0 |  |
Fair Value, Measurements, Recurring | Level 2 |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Available-for-sale securities |  | 66,710 |  |  | 62,101 |  |
Mortgage loans held for sale |  | 2,288 |  |  | 2,251 |  |
Mortgage servicing rights |  | 0 |  |  | 0 |  |
Derivative assets before netting |  | 4,797 |  |  | 5,208 |  |
Other assets |  | 2,725 |  |  | 1,769 |  |
Total assets |  | 76,520 |  |  | 71,329 |  |
Time deposits |  | 4,924 |  |  | 5,754 |  |
Long-term debt |  | 1,408 |  |  | 391 |  |
Derivative liabilities before netting |  | 4,874 |  |  | 5,131 |  |
Short-term borrowings and other liabilities |  | 1,840 |  |  | 1,460 |  |
Total liabilities |  | 13,046 |  |  | 12,736 |  |
Fair Value, Measurements, Recurring | Level 2 | U.S. Treasury and agencies |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Available-for-sale securities |  | 4,713 |  |  | 4,496 |  |
Fair Value, Measurements, Recurring | Level 2 | Residential mortgage-backed securities |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Available-for-sale securities |  | 37,677 |  |  | 33,281 |  |
Fair Value, Measurements, Recurring | Level 2 | Commercial mortgage-backed securities | Agency |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Available-for-sale securities |  | 7,694 |  |  | 7,351 |  |
Fair Value, Measurements, Recurring | Level 2 | Commercial mortgage-backed securities | Non-agency |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Available-for-sale securities |  | 7 |  |  | 6 |  |
Fair Value, Measurements, Recurring | Level 2 | Asset-backed securities |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Available-for-sale securities |  | 6,865 |  |  | 7,165 |  |
Fair Value, Measurements, Recurring | Level 2 | Obligations of state and political subdivisions |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Available-for-sale securities |  | 9,486 |  |  | 9,552 |  |
Fair Value, Measurements, Recurring | Level 2 | Other |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Available-for-sale securities |  | 268 |  |  | 250 |  |
Fair Value, Measurements, Recurring | Level 3 |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Available-for-sale securities |  | 0 |  |  | 0 |  |
Mortgage loans held for sale |  | 0 |  |  | 0 |  |
Mortgage servicing rights |  | 3,289 |  |  | 3,369 |  |
Derivative assets before netting |  | 2,083 |  |  | 1,202 |  |
Other assets |  | 0 |  |  | 0 |  |
Total assets |  | 5,372 |  |  | 4,571 |  |
Time deposits |  | 0 |  |  | 0 |  |
Long-term debt |  | 0 |  |  | 0 |  |
Derivative liabilities before netting |  | 2,013 |  |  | 3,002 |  |
Short-term borrowings and other liabilities |  | 0 |  |  | 0 |  |
Total liabilities |  | 2,013 |  |  | 3,002 |  |
Fair Value, Measurements, Recurring | Level 3 | U.S. Treasury and agencies |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Available-for-sale securities |  | 0 |  |  | 0 |  |
Fair Value, Measurements, Recurring | Level 3 | Residential mortgage-backed securities |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Available-for-sale securities |  | 0 |  |  | 0 |  |
Fair Value, Measurements, Recurring | Level 3 | Commercial mortgage-backed securities | Agency |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Available-for-sale securities |  | 0 |  |  | 0 |  |
Fair Value, Measurements, Recurring | Level 3 | Commercial mortgage-backed securities | Non-agency |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Available-for-sale securities |  | 0 |  |  | 0 |  |
Fair Value, Measurements, Recurring | Level 3 | Asset-backed securities |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Available-for-sale securities |  | 0 |  |  | 0 |  |
Fair Value, Measurements, Recurring | Level 3 | Obligations of state and political subdivisions |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Available-for-sale securities |  | 0 |  |  | 0 |  |
Fair Value, Measurements, Recurring | Level 3 | Other |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Available-for-sale securities |  | $ 0 |  |  | $ 0 |  |
[1] | Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.

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