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Fair Value Measurement - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021
Assets: |  |  |
Securities available for sale | $ 89,076 | $ 95,261 |
Loans Held-for-sale, Fair Value Disclosure | 928 | 1,000 |
Derivative assets, gross amount | 4,519 | 2,690 |
Derivative asset, netting adjustments | (761) | (542) |
Derivative asset | 3,758 | 2,148 |
Liabilities: |  |  |
Derivative liabilities, gross amount | 4,853 | 1,868 |
Derivative liability, netting adjustments | (1,282) | (544) |
Derivative liability | 3,571 | 1,324 |
Net valuation allowance | 10 | 11 |
Level 1 |  |  |
Assets: |  |  |
Loans Held-for-sale, Fair Value Disclosure | 0 | 0 |
Level 2 |  |  |
Assets: |  |  |
Loans Held-for-sale, Fair Value Disclosure | 227 | 5,091 |
Level 3 |  |  |
Assets: |  |  |
Loans Held-for-sale, Fair Value Disclosure | 0 | 0 |
Recurring |  |  |
Assets: |  |  |
Securities available for sale | 89,076 | 95,261 |
Loans Held-for-sale, Fair Value Disclosure | 928 | 1,026 |
Derivative asset | 3,758 | 2,148 |
Other assets | 568 | 573 |
Total assets | 94,330 | 99,008 |
Liabilities: |  |  |
Derivative liability | 3,571 | 1,324 |
Recurring | Level 1 |  |  |
Assets: |  |  |
Securities available for sale | 9,700 | 9,648 |
Loans Held-for-sale, Fair Value Disclosure | 0 | 0 |
Derivative assets, gross amount | 1,106 | 406 |
Other assets | 525 | 526 |
Total assets | 11,331 | 10,580 |
Other assets: |  |  |
Deferred compensation plan assets | 494 | 490 |
Liabilities: |  |  |
Derivative liabilities, gross amount | 2,225 | 838 |
Recurring | Level 2 |  |  |
Assets: |  |  |
Securities available for sale | 79,144 | 85,346 |
Loans Held-for-sale, Fair Value Disclosure | 928 | 1,026 |
Derivative assets, gross amount | 3,211 | 2,200 |
Other assets | 4 | 6 |
Total assets | 83,287 | 88,578 |
Liabilities: |  |  |
Derivative liabilities, gross amount | 2,448 | 965 |
Recurring | Level 3 |  |  |
Assets: |  |  |
Securities available for sale | 232 | 267 |
Loans Held-for-sale, Fair Value Disclosure | 0 | 0 |
Derivative assets, gross amount | 202 | 84 | $ 157
Other assets | 39 | 41 |
Total assets | 473 | 392 |
Other assets: |  |  |
Retained interests in securitizations | 39 | 41 |
Liabilities: |  |  |
Derivative liabilities, gross amount | 180 | 65 | $ 123
Recurring | Fair Value Inputs Level 1 And Level 2 [Member] |  |  |
Other assets: |  |  |
Equity securities | 35 | 42 |
Liabilities: |  |  |
Debt and Equity Securities, Unrealized Gain (Loss) | (5) | (36) |
U.S. Treasury securities |  |  |
Assets: |  |  |
Securities available for sale | 9,497 | 9,442 |
U.S. Treasury securities | Recurring |  |  |
Assets: |  |  |
Securities available for sale | 9,497 | 9,442 |
U.S. Treasury securities | Recurring | Level 1 |  |  |
Assets: |  |  |
Securities available for sale | 9,497 | 9,442 |
U.S. Treasury securities | Recurring | Level 2 |  |  |
Assets: |  |  |
Securities available for sale | 0 | 0 |
U.S. Treasury securities | Recurring | Level 3 |  |  |
Assets: |  |  |
Securities available for sale | 0 | 0 |
RMBS |  |  |
Assets: |  |  |
Securities available for sale | 68,425 | 73,616 |
RMBS | Recurring |  |  |
Assets: |  |  |
Securities available for sale | 68,425 | 73,616 |
RMBS | Recurring | Level 1 |  |  |
Assets: |  |  |
Securities available for sale | 0 | 0 |
RMBS | Recurring | Level 2 |  |  |
Assets: |  |  |
Securities available for sale | 68,214 | 73,358 |
RMBS | Recurring | Level 3 |  |  |
Assets: |  |  |
Securities available for sale | 211 | 258 |
CMBS | Recurring |  |  |
Assets: |  |  |
Securities available for sale | 8,365 | 9,369 |
CMBS | Recurring | Level 1 |  |  |
Assets: |  |  |
Securities available for sale | 0 | 0 |
CMBS | Recurring | Level 2 |  |  |
Assets: |  |  |
Securities available for sale | 8,344 | 9,360 |
CMBS | Recurring | Level 3 |  |  |
Assets: |  |  |
Securities available for sale | 21 | 9 |
Other securities |  |  |
Assets: |  |  |
Securities available for sale | 2,789 | 2,834 |
Other securities | Recurring |  |  |
Assets: |  |  |
Securities available for sale | 2,789 | 2,834 |
Other securities | Recurring | Level 1 |  |  |
Assets: |  |  |
Securities available for sale | 203 | 206 |
Other securities | Recurring | Level 2 |  |  |
Assets: |  |  |
Securities available for sale | 2,586 | 2,628 |
Other securities | Recurring | Level 3 |  |  |
Assets: |  |  |
Securities available for sale | $ 0 | $ 0 |

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