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Securities - Available for Sale Securities (Unrealized Loss Position) (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Held-to-maturity securities: |  |
Temporarily impaired securities, fair value, less than 12 months | $ 18,025 | $ 4,830
Temporarily impaired securities, gross unrealized losses, less than 12 months | 675 | 58
Temporarily impaired securities, fair value, 12 months or longer | 28 | 29
Temporarily impaired securities, gross unrealized losses, 12 months or longer | 0 | 0
Temporarily impaired securities, fair value | 18,053 | 4,859
Temporarily impaired securities, gross unrealized losses | 675 | 58
U.S. Treasury, agencies and corporations |  |
Securities available for sale: |  |
Fair value, less than 12 months | 4,488 | 0
Gross unrealized losses, less than 12 months | 13 | 0
Fair value, 12 months or longer | 0 | 0
Gross unrealized losses, 12 months or longer | 0 | 0
Fair value | 4,488 | 0
Gross unrealized losses | 13 | 0
Agency residential collateralized mortgage obligations |  |
Securities available for sale: |  |
Fair value, less than 12 months | 5,401 | 2,110
Gross unrealized losses, less than 12 months | 219 | 25
Fair value, 12 months or longer | 0 | 0
Gross unrealized losses, 12 months or longer | 0 | 0
Fair value | 5,401 | 2,110
Gross unrealized losses | 219 | 25
Held-to-maturity securities: |  |
Fair value, less than 12 months | 0 | 0
Gross unrealized losses, less than 12 months | 0 | 0
Fair value, 12 months or longer | 20 | 24
Gross unrealized losses, 12 months or longer | 0 | 0
Fair value | 20 | 24
Gross unrealized losses | 0 | 0
Agency commercial mortgage-backed securities |  |
Securities available for sale: |  |
Fair value, less than 12 months | 5,194 | 2,709
Gross unrealized losses, less than 12 months | 394 | 33
Fair value, 12 months or longer | 0 | 0
Gross unrealized losses, 12 months or longer | 0 | 0
Fair value | 5,194 | 2,709
Gross unrealized losses | 394 | 33
Asset-backed securities |  |
Held-to-maturity securities: |  |
Fair value, less than 12 months | 9 | 0
Gross unrealized losses, less than 12 months | 0 | 0
Fair value, 12 months or longer | 0 | 0
Gross unrealized losses, 12 months or longer | 0 | 0
Fair value | 9 | 0
Gross unrealized losses | 0 | 0
Other securities |  |
Securities available for sale: |  |
Fair value, less than 12 months | 0 |
Gross unrealized losses, less than 12 months | 0 |
Fair value, 12 months or longer | 1 |
Gross unrealized losses, 12 months or longer | 0 |
Fair value | 1 |
Gross unrealized losses | 0 |
Held-to-maturity securities: |  |
Fair value, less than 12 months | 3 | 5
Gross unrealized losses, less than 12 months | 0 | 0
Fair value, 12 months or longer | 0 | 0
Gross unrealized losses, 12 months or longer | 0 | 0
Fair value | 3 | 5
Gross unrealized losses | 0 | 0
Mortgage-backed securities | Agency residential mortgage-backed securities |  |
Securities available for sale: |  |
Fair value, less than 12 months | 2,930 | 6
Gross unrealized losses, less than 12 months | 49 | 0
Fair value, 12 months or longer | 7 | 5
Gross unrealized losses, 12 months or longer | 0 | 0
Fair value | 2,937 | 11
Gross unrealized losses | $ 49 | $ 0

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