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Investment Securities - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Marketable Securities [Abstract] |  |  |  |  |
Gains (losses) on available-for-sale securities | $ 0 | $ 0 | $ 0 | $ 0 |
Proceeds from sales of securities available for sale | 6 | 0 | 33 | 9 |
Available-for-sale, accrued interest, after allowance for credit loss |  |  |  |  | $ 22
Carrying amount of equity investments without a readily determinable fair value | 73 |  | 73 |  | $ 57
Unrealized gain (loss) for equity investments with readily determinable fair values | $ 3 | $ 5 | $ 6 | $ (1) |

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