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Fair Value Measurement - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Assets: |  |  |
Securities available for sale (amortized cost of $97.6 billion and allowance for credit losses of $1 million as of December 31, 2020) | $ 100,445 | $ 79,213 |
Loans held for sale | 596 | 251 |
Derivative assets, gross amount | 3,415 | 1,729 |
Derivative asset, netting adjustments | (1,148) | (633) |
Derivative asset | 2,267 | 1,096 |
Liabilities: |  |  |
Derivative liabilities, gross amount | 1,518 | 1,197 |
Derivative liability, netting adjustments | (739) | (523) |
Derivative liability | 779 | 674 |
Net valuation allowance | 31 | 12 |
Level 1 |  |  |
Assets: |  |  |
Loans held for sale | 0 | 0 |
Level 2 |  |  |
Assets: |  |  |
Loans held for sale | 2,214 | 149 |
Level 3 |  |  |
Assets: |  |  |
Loans held for sale | 0 | 0 |
Recurring |  |  |
Assets: |  |  |
Securities available for sale (amortized cost of $97.6 billion and allowance for credit losses of $1 million as of December 31, 2020) | 100,445 | 79,213 |
Loans held for sale | 596 | 251 |
Derivative asset | 2,267 | 1,096 |
Other assets | 1,037 | 410 |
Total assets | 104,345 | 80,970 |
Liabilities: |  |  |
Derivative liability | 779 | 674 |
Recurring | Level 1 |  |  |
Assets: |  |  |
Securities available for sale (amortized cost of $97.6 billion and allowance for credit losses of $1 million as of December 31, 2020) | 9,460 | 4,355 |
Loans held for sale | 0 | 0 |
Derivative assets, gross amount | 268 | 84 |
Other assets | 430 | 344 |
Total assets | 10,158 | 4,783 |
Other assets: |  |  |
Deferred compensation plan assets | 414 | 343 |
Equity securities |  | 1 |
Liabilities: |  |  |
Derivative liabilities, gross amount | 271 | 17 |
Recurring | Level 2 |  |  |
Assets: |  |  |
Securities available for sale (amortized cost of $97.6 billion and allowance for credit losses of $1 million as of December 31, 2020) | 90,546 | 74,416 |
Loans held for sale | 596 | 251 |
Derivative assets, gross amount | 3,006 | 1,568 |
Other assets | 552 | 0 |
Total assets | 94,700 | 76,235 |
Liabilities: |  |  |
Derivative liabilities, gross amount | 1,137 | 1,129 |
Recurring | Level 3 |  |  |
Assets: |  |  |
Securities available for sale (amortized cost of $97.6 billion and allowance for credit losses of $1 million as of December 31, 2020) | 439 | 442 |
Loans held for sale | 0 | 0 |
Derivative assets, gross amount | 141 | 77 | $ 38
Other assets | 55 | 66 |
Total assets | 635 | 585 |
Other assets: |  |  |
Retained interests in securitizations | 55 | 66 |
Liabilities: |  |  |
Derivative liabilities, gross amount | 110 | 51 | $ 48
Recurring | Fair Value Inputs Level 1 And Level 2 [Member] |  |  |
Other assets: |  |  |
Equity securities | 568 |  |
Liabilities: |  |  |
Debt and Equity Securities, Unrealized Gain (Loss) | 535 |  |
U.S. Treasury securities |  |  |
Assets: |  |  |
Securities available for sale (amortized cost of $97.6 billion and allowance for credit losses of $1 million as of December 31, 2020) | 9,318 | 4,124 |
U.S. Treasury securities | Recurring |  |  |
Assets: |  |  |
Securities available for sale (amortized cost of $97.6 billion and allowance for credit losses of $1 million as of December 31, 2020) | 9,318 | 4,124 |
U.S. Treasury securities | Recurring | Level 1 |  |  |
Assets: |  |  |
Securities available for sale (amortized cost of $97.6 billion and allowance for credit losses of $1 million as of December 31, 2020) | 9,318 | 4,124 |
U.S. Treasury securities | Recurring | Level 2 |  |  |
Assets: |  |  |
Securities available for sale (amortized cost of $97.6 billion and allowance for credit losses of $1 million as of December 31, 2020) | 0 | 0 |
U.S. Treasury securities | Recurring | Level 3 |  |  |
Assets: |  |  |
Securities available for sale (amortized cost of $97.6 billion and allowance for credit losses of $1 million as of December 31, 2020) | 0 | 0 |
RMBS |  |  |
Assets: |  |  |
Securities available for sale (amortized cost of $97.6 billion and allowance for credit losses of $1 million as of December 31, 2020) | 76,703 | 64,338 |
RMBS | Recurring |  |  |
Assets: |  |  |
Securities available for sale (amortized cost of $97.6 billion and allowance for credit losses of $1 million as of December 31, 2020) | 76,703 | 64,338 |
RMBS | Recurring | Level 1 |  |  |
Assets: |  |  |
Securities available for sale (amortized cost of $97.6 billion and allowance for credit losses of $1 million as of December 31, 2020) | 0 | 0 |
RMBS | Recurring | Level 2 |  |  |
Assets: |  |  |
Securities available for sale (amortized cost of $97.6 billion and allowance for credit losses of $1 million as of December 31, 2020) | 76,375 | 63,909 |
RMBS | Recurring | Level 3 |  |  |
Assets: |  |  |
Securities available for sale (amortized cost of $97.6 billion and allowance for credit losses of $1 million as of December 31, 2020) | 328 | 429 |
CMBS | Recurring |  |  |
Assets: |  |  |
Securities available for sale (amortized cost of $97.6 billion and allowance for credit losses of $1 million as of December 31, 2020) | 11,735 | 9,426 |
CMBS | Recurring | Level 1 |  |  |
Assets: |  |  |
Securities available for sale (amortized cost of $97.6 billion and allowance for credit losses of $1 million as of December 31, 2020) | 0 | 0 |
CMBS | Recurring | Level 2 |  |  |
Assets: |  |  |
Securities available for sale (amortized cost of $97.6 billion and allowance for credit losses of $1 million as of December 31, 2020) | 11,624 | 9,413 |
CMBS | Recurring | Level 3 |  |  |
Assets: |  |  |
Securities available for sale (amortized cost of $97.6 billion and allowance for credit losses of $1 million as of December 31, 2020) | 111 | 13 |
Other securities |  |  |
Assets: |  |  |
Securities available for sale (amortized cost of $97.6 billion and allowance for credit losses of $1 million as of December 31, 2020) | 2,689 | 1,325 |
Other securities | Recurring |  |  |
Assets: |  |  |
Securities available for sale (amortized cost of $97.6 billion and allowance for credit losses of $1 million as of December 31, 2020) | 2,689 | 1,325 |
Other securities | Recurring | Level 1 |  |  |
Assets: |  |  |
Securities available for sale (amortized cost of $97.6 billion and allowance for credit losses of $1 million as of December 31, 2020) | 142 | 231 |
Other securities | Recurring | Level 2 |  |  |
Assets: |  |  |
Securities available for sale (amortized cost of $97.6 billion and allowance for credit losses of $1 million as of December 31, 2020) | 2,547 | 1,094 |
Other securities | Recurring | Level 3 |  |  |
Assets: |  |  |
Securities available for sale (amortized cost of $97.6 billion and allowance for credit losses of $1 million as of December 31, 2020) | $ 0 | $ 0 |

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