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Other Assets (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020
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Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |  |  |
Federal Home Loan Bank stock | $ 39 | $ 40 |  |
Tax credit investments and investments in non-consolidated entities | 702 | 156 |  |
Counterparty receivables | 106 | 0 |  |
Fair value of derivative financial instruments | 110 | 0 |  |
Right of use assets | 384 | 64 |  |
Pension assets | 297 | 289 |  |
Income taxes receivable | 834 | 799 |  |
Other real estate owned | 43 | 40 |  |
Servicing asset | 28 | 23 | $ 23 | $ 18
Accrued interest receivable | 247 | 134 |  |
Other | 540 | 194 |  |
Other assets | $ 3,330 | $ 1,739 |  |

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