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Securities - Summary of Securities in Unrealized Loss Position (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Held-to-maturity securities: |  |
Temporarily impaired securities, fair value, less than 12 months | $ 7,250 | $ 647
Temporarily impaired securities, gross unrealized losses, less than 12 months | 60 | 2
Temporarily impaired securities, fair value, 12 months or longer | 7,382 | 24,158
Temporarily impaired securities, gross unrealized losses, 12 months or longer | 113 | 943
Temporarily impaired securities, fair value | 14,632 | 24,805
Temporarily impaired securities, gross unrealized losses | 173 | 945
U.S. Treasury, Agencies, and Corporations [Member] |  |
Securities available for sale: |  |
Fair value, less than 12 months | 30 | 0
Gross unrealized losses, less than 12 months (less than $1 million for agency residential mortgage-backed securities and U.S. Treasury, Agencies and Corporations) |  | 0
Fair value, 12 months or longer | 30 | 147
Gross unrealized losses, 12 months or longer | 1 | 3
Fair value | 60 | 147
Gross unrealized losses | 0 | 3
Collateralized Mortgage Obligations [Member] |  |
Securities available for sale: |  |
Fair value, less than 12 months | 3,432 | 570
Gross unrealized losses, less than 12 months (less than $1 million for agency residential mortgage-backed securities and U.S. Treasury, Agencies and Corporations) | 20 | 2
Fair value, 12 months or longer | 3,221 | 10,945
Gross unrealized losses, 12 months or longer | 51 | 371
Fair value | 6,653 | 11,515
Gross unrealized losses | 71 | 373
Held-to-maturity securities: |  |
Fair value, less than 12 months | 1,626 | 0
Gross unrealized losses, less than 12 months (less than $1 million for agency commercial mortgage-backed securities and other securities) | 14 | 0
Fair value, 12 months or longer | 2,289 | 6,416
Gross unrealized losses, 12 months or longer (less than $1 million for other securities in 2017) | 35 | 254
Fair value | 3,915 | 6,416
Gross unrealized losses (less than $1 million for other securities) | 49 | 254
Commercial Mortgage Backed Securities [Member] |  |
Securities available for sale: |  |
Fair value, less than 12 months | 1,541 | 0
Gross unrealized losses, less than 12 months (less than $1 million for agency residential mortgage-backed securities and U.S. Treasury, Agencies and Corporations) | 17 | 0
Fair value, 12 months or longer | 1,213 | 1,729
Gross unrealized losses, 12 months or longer | 23 | 132
Fair value | 2,754 | 1,729
Gross unrealized losses |  | 132
Held-to-maturity securities: |  |
Fair value, less than 12 months | 518 | 73
Gross unrealized losses, less than 12 months (less than $1 million for agency commercial mortgage-backed securities and other securities) | 9 | 1
Fair value, 12 months or longer | 0 | 3,359
Gross unrealized losses, 12 months or longer (less than $1 million for other securities in 2017) | 0 | 133
Fair value | 518 | 3,432
Gross unrealized losses (less than $1 million for other securities) | 9 | 133
Asset-backed Securities [Member] |  |
Held-to-maturity securities: |  |
Fair value, less than 12 months | 11 |
Gross unrealized losses, less than 12 months (less than $1 million for agency commercial mortgage-backed securities and other securities) | 1 |
Fair value, 12 months or longer | 0 |
Gross unrealized losses, 12 months or longer (less than $1 million for other securities in 2017) | 0 |
Fair value | 11 |
Gross unrealized losses (less than $1 million for other securities) | 0 |
Other Securities [Member] |  |
Held-to-maturity securities: |  |
Fair value, less than 12 months | 3 |
Gross unrealized losses, less than 12 months (less than $1 million for agency commercial mortgage-backed securities and other securities) | 1 |
Fair value, 12 months or longer | 0 |
Gross unrealized losses, 12 months or longer (less than $1 million for other securities in 2017) | 0 |
Fair value | 3 |
Gross unrealized losses (less than $1 million for other securities) | 0 |
Other Mortgage-Backed Securities [Member] | Residential Mortgage Backed Securities [Member] |  |
Securities available for sale: |  |
Fair value, less than 12 months | 33 | 4
Gross unrealized losses, less than 12 months (less than $1 million for agency residential mortgage-backed securities and U.S. Treasury, Agencies and Corporations) | 1 | 1
Fair value, 12 months or longer | 629 | 1,087
Gross unrealized losses, 12 months or longer | 4 | 36
Fair value | 662 | 1,091
Gross unrealized losses | 4 | 36
Held-to-maturity securities: |  |
Fair value, less than 12 months | 56 | 0
Gross unrealized losses, less than 12 months (less than $1 million for agency commercial mortgage-backed securities and other securities) | 1 | 0
Fair value, 12 months or longer | 0 | 475
Gross unrealized losses, 12 months or longer (less than $1 million for other securities in 2017) | 0 | 14
Fair value | 56 | 475
Gross unrealized losses (less than $1 million for other securities) | 0 | $ 14
Other Mortgage-Backed Securities [Member] | Commercial Mortgage Backed Securities [Member] |  |
Securities available for sale: |  |
Gross unrealized losses | $ 40 |

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