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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, 2021 | Dec. 31, 2020 | Mar. 31, 2020
Assets: |  |  |
Securities available for sale (amortized cost of $97.8 billion and $97.6 billion and allowance for credit losses of $2 million and $1 million as of March 31, 2021 and December 31, 2020, respectively) | $ 99,165 | $ 100,445 |
Loans held for sale | 908 | 596 |
Derivative assets, gross amount | 2,869 | 3,415 |
Derivative asset, netting adjustments | (844) | (1,148) |
Derivative asset | 2,025 | 2,267 |
Liabilities: |  |  |
Derivative liabilities, gross amount | 1,651 | 1,518 |
Derivative liability, netting adjustments | (679) | (739) |
Derivative liability | 972 | 779 |
Net valuation allowance | 26 | 31 |
Level 1 |  |  |
Assets: |  |  |
Loans held for sale | 0 | 0 |
Level 2 |  |  |
Assets: |  |  |
Loans held for sale | 2,082 | 2,214 |
Level 3 |  |  |
Assets: |  |  |
Loans held for sale | 0 | 0 |
Recurring |  |  |
Assets: |  |  |
Securities available for sale (amortized cost of $97.8 billion and $97.6 billion and allowance for credit losses of $2 million and $1 million as of March 31, 2021 and December 31, 2020, respectively) | 99,165 | 100,445 |
Loans held for sale | 908 | 596 |
Derivative asset | 2,025 | 2,267 |
Other assets | 676 | 1,037 |
Total assets | 102,774 | 104,345 |
Liabilities: |  |  |
Derivative liability | 972 | 779 |
Recurring | Level 1 |  |  |
Assets: |  |  |
Securities available for sale (amortized cost of $97.8 billion and $97.6 billion and allowance for credit losses of $2 million and $1 million as of March 31, 2021 and December 31, 2020, respectively) | 9,447 | 9,460 |
Loans held for sale | 0 | 0 |
Derivative assets, gross amount | 463 | 268 |
Other assets | 624 | 430 |
Total assets | 10,534 | 10,158 |
Other assets: |  |  |
Deferred compensation plan assets | 449 | 414 |
Liabilities: |  |  |
Derivative liabilities, gross amount | 528 | 271 |
Recurring | Level 2 |  |  |
Assets: |  |  |
Securities available for sale (amortized cost of $97.8 billion and $97.6 billion and allowance for credit losses of $2 million and $1 million as of March 31, 2021 and December 31, 2020, respectively) | 89,382 | 90,546 |
Loans held for sale | 908 | 596 |
Derivative assets, gross amount | 2,249 | 3,006 |
Other assets | 2 | 552 |
Total assets | 92,541 | 94,700 |
Liabilities: |  |  |
Derivative liabilities, gross amount | 1,000 | 1,137 |
Recurring | Level 3 |  |  |
Assets: |  |  |
Securities available for sale (amortized cost of $97.8 billion and $97.6 billion and allowance for credit losses of $2 million and $1 million as of March 31, 2021 and December 31, 2020, respectively) | 336 | 439 |
Loans held for sale | 0 | 0 |
Derivative assets, gross amount | 157 | 141 | $ 147
Other assets | 50 | 55 |
Total assets | 543 | 635 |
Other assets: |  |  |
Retained interests in securitizations | 50 | 55 |
Liabilities: |  |  |
Derivative liabilities, gross amount | 123 | 110 | $ 81
Recurring | Fair Value Inputs Level 1 And Level 2 [Member] |  |  |
Other assets: |  |  |
Equity securities | 177 | 568 |
Liabilities: |  |  |
Debt and Equity Securities, Unrealized Gain (Loss) | (38) | 535 |
U.S. Treasury securities |  |  |
Assets: |  |  |
Securities available for sale (amortized cost of $97.8 billion and $97.6 billion and allowance for credit losses of $2 million and $1 million as of March 31, 2021 and December 31, 2020, respectively) | 9,248 | 9,318 |
U.S. Treasury securities | Recurring |  |  |
Assets: |  |  |
Securities available for sale (amortized cost of $97.8 billion and $97.6 billion and allowance for credit losses of $2 million and $1 million as of March 31, 2021 and December 31, 2020, respectively) | 9,248 | 9,318 |
U.S. Treasury securities | Recurring | Level 1 |  |  |
Assets: |  |  |
Securities available for sale (amortized cost of $97.8 billion and $97.6 billion and allowance for credit losses of $2 million and $1 million as of March 31, 2021 and December 31, 2020, respectively) | 9,248 | 9,318 |
U.S. Treasury securities | Recurring | Level 2 |  |  |
Assets: |  |  |
Securities available for sale (amortized cost of $97.8 billion and $97.6 billion and allowance for credit losses of $2 million and $1 million as of March 31, 2021 and December 31, 2020, respectively) | 0 | 0 |
U.S. Treasury securities | Recurring | Level 3 |  |  |
Assets: |  |  |
Securities available for sale (amortized cost of $97.8 billion and $97.6 billion and allowance for credit losses of $2 million and $1 million as of March 31, 2021 and December 31, 2020, respectively) | 0 | 0 |
RMBS |  |  |
Assets: |  |  |
Securities available for sale (amortized cost of $97.8 billion and $97.6 billion and allowance for credit losses of $2 million and $1 million as of March 31, 2021 and December 31, 2020, respectively) | 75,622 | 76,703 |
RMBS | Recurring |  |  |
Assets: |  |  |
Securities available for sale (amortized cost of $97.8 billion and $97.6 billion and allowance for credit losses of $2 million and $1 million as of March 31, 2021 and December 31, 2020, respectively) | 75,622 | 76,703 |
RMBS | Recurring | Level 1 |  |  |
Assets: |  |  |
Securities available for sale (amortized cost of $97.8 billion and $97.6 billion and allowance for credit losses of $2 million and $1 million as of March 31, 2021 and December 31, 2020, respectively) | 0 | 0 |
RMBS | Recurring | Level 2 |  |  |
Assets: |  |  |
Securities available for sale (amortized cost of $97.8 billion and $97.6 billion and allowance for credit losses of $2 million and $1 million as of March 31, 2021 and December 31, 2020, respectively) | 75,296 | 76,375 |
RMBS | Recurring | Level 3 |  |  |
Assets: |  |  |
Securities available for sale (amortized cost of $97.8 billion and $97.6 billion and allowance for credit losses of $2 million and $1 million as of March 31, 2021 and December 31, 2020, respectively) | 326 | 328 |
CMBS | Recurring |  |  |
Assets: |  |  |
Securities available for sale (amortized cost of $97.8 billion and $97.6 billion and allowance for credit losses of $2 million and $1 million as of March 31, 2021 and December 31, 2020, respectively) | 11,274 | 11,735 |
CMBS | Recurring | Level 1 |  |  |
Assets: |  |  |
Securities available for sale (amortized cost of $97.8 billion and $97.6 billion and allowance for credit losses of $2 million and $1 million as of March 31, 2021 and December 31, 2020, respectively) | 0 | 0 |
CMBS | Recurring | Level 2 |  |  |
Assets: |  |  |
Securities available for sale (amortized cost of $97.8 billion and $97.6 billion and allowance for credit losses of $2 million and $1 million as of March 31, 2021 and December 31, 2020, respectively) | 11,264 | 11,624 |
CMBS | Recurring | Level 3 |  |  |
Assets: |  |  |
Securities available for sale (amortized cost of $97.8 billion and $97.6 billion and allowance for credit losses of $2 million and $1 million as of March 31, 2021 and December 31, 2020, respectively) | 10 | 111 |
Other securities |  |  |
Assets: |  |  |
Securities available for sale (amortized cost of $97.8 billion and $97.6 billion and allowance for credit losses of $2 million and $1 million as of March 31, 2021 and December 31, 2020, respectively) | 3,021 | 2,689 |
Other securities | Recurring |  |  |
Assets: |  |  |
Securities available for sale (amortized cost of $97.8 billion and $97.6 billion and allowance for credit losses of $2 million and $1 million as of March 31, 2021 and December 31, 2020, respectively) | 3,021 | 2,689 |
Other securities | Recurring | Level 1 |  |  |
Assets: |  |  |
Securities available for sale (amortized cost of $97.8 billion and $97.6 billion and allowance for credit losses of $2 million and $1 million as of March 31, 2021 and December 31, 2020, respectively) | 199 | 142 |
Other securities | Recurring | Level 2 |  |  |
Assets: |  |  |
Securities available for sale (amortized cost of $97.8 billion and $97.6 billion and allowance for credit losses of $2 million and $1 million as of March 31, 2021 and December 31, 2020, respectively) | 2,822 | 2,547 |
Other securities | Recurring | Level 3 |  |  |
Assets: |  |  |
Securities available for sale (amortized cost of $97.8 billion and $97.6 billion and allowance for credit losses of $2 million and $1 million as of March 31, 2021 and December 31, 2020, respectively) | $ 0 | $ 0 |

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