Securities - Gains and Losses on Sales of AFS Debt Securities (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended |
|---|---|---|
Sep. 30, 2020 |
Sep. 30, 2020 |
|
| Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract] | ||
| Debt securities, available for sale, realized gain | $ 4 | $ 383 |
| Debt securities, available for sale, realized loss | (2) | (4) |
| Debt securities, available for sale, net gains | 2 | 379 |
| Debt securities, available for sale, realized gain (loss), income tax expense (benefit) | $ 1 | $ 95 |
| X | ||||||||||
- Definition Debt Securities, Available-for-sale, Realized Gain (Loss), Income Tax Expense No definition available.
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition Amount of realized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|