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Investment Securities (Summary) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Available-for-sale [Line Items] |  |
Securities available for sale debt securities, amortized cost | $ 67,790 | $ 63,514
Securities available for sale debt securities, unrealized gains | 1,471 | 710
Securities available for sale debt securities, unrealized losses | (98) | (835)
Securities available for sale debt securities, fair value | 69,163 | 63,389
Held-to-maturity, debt securities | 17,661 | 19,312
Held-to-maturity securities, unrealized gains | 423 | 118
Held-to-maturity securities, unrealized losses | (40) | (411)
Held-to-maturity securities, fair value | 18,044 | 19,019
US Treasury and Government Agencies Securities |  |
Available-for-sale [Line Items] |  |
Securities available for sale debt securities, amortized cost | 16,150 | 18,104
Securities available for sale debt securities, unrealized gains | 382 | 133
Securities available for sale debt securities, unrealized losses | (16) | (137)
Securities available for sale debt securities, fair value | 16,516 | 18,100
Held-to-maturity, debt securities | 776 | 758
Held-to-maturity securities, unrealized gains | 56 | 28
Held-to-maturity securities, unrealized losses |  | (23)
Held-to-maturity securities, fair value | 832 | 763
Residential mortgage-backed Securities | Mortgage-backed Securities Agency |  |
Available-for-sale [Line Items] |  |
Held-to-maturity, debt securities | 14,419 | 15,740
Held-to-maturity securities, unrealized gains | 270 | 32
Held-to-maturity securities, unrealized losses | (26) | (358)
Held-to-maturity securities, fair value | 14,663 | 15,414
Residential mortgage-backed Securities | Mortgage-backed Securities Non-agency |  |
Available-for-sale [Line Items] |  |
Held-to-maturity, debt securities | 133 | 152
Held-to-maturity securities, unrealized gains | 7 | 2
Held-to-maturity securities, fair value | 140 | 154
Commercial Mortgage Backed Securities | Mortgage-backed Securities Agency |  |
Available-for-sale [Line Items] |  |
Held-to-maturity, debt securities | 59 | 143
Held-to-maturity securities, unrealized gains | 1 | 1
Held-to-maturity securities, unrealized losses |  | (1)
Held-to-maturity securities, fair value | 60 | 143
Commercial Mortgage Backed Securities | Mortgage-backed Securities Non-agency |  |
Available-for-sale [Line Items] |  |
Held-to-maturity, debt securities | 430 | 488
Held-to-maturity securities, unrealized gains | 4 | 1
Held-to-maturity securities, unrealized losses |  | (1)
Held-to-maturity securities, fair value | 434 | 488
Asset-backed Securities |  |
Available-for-sale [Line Items] |  |
Securities available for sale debt securities, amortized cost | 5,044 | 4,933
Securities available for sale debt securities, unrealized gains | 78 | 59
Securities available for sale debt securities, unrealized losses | (8) | (20)
Securities available for sale debt securities, fair value | 5,114 | 4,972
Held-to-maturity, debt securities | 52 | 182
Held-to-maturity securities, unrealized gains |  | 1
Held-to-maturity securities, fair value | 52 | 183
Other debt |  |
Available-for-sale [Line Items] |  |
Securities available for sale debt securities, amortized cost | 2,788 | 3,821
Securities available for sale debt securities, unrealized gains | 121 | 96
Securities available for sale debt securities, unrealized losses | (1) | (38)
Securities available for sale debt securities, fair value | 2,908 | 3,879
Held-to-maturity, debt securities | 1,792 | 1,849
Held-to-maturity securities, unrealized gains | 85 | 53
Held-to-maturity securities, unrealized losses | (14) | (28)
Held-to-maturity securities, fair value | 1,863 | 1,874
Mortgage-backed Securities Agency | Residential mortgage-backed Securities |  |
Available-for-sale [Line Items] |  |
Securities available for sale debt securities, amortized cost | 35,847 | 29,413
Securities available for sale debt securities, unrealized gains | 517 | 104
Securities available for sale debt securities, unrealized losses | (43) | (524)
Securities available for sale debt securities, fair value | 36,321 | 28,993
Mortgage-backed Securities Agency | Commercial Mortgage Backed Securities |  |
Available-for-sale [Line Items] |  |
Securities available for sale debt securities, amortized cost | 3,094 | 2,630
Securities available for sale debt securities, unrealized gains | 42 | 13
Securities available for sale debt securities, unrealized losses | (18) | (66)
Securities available for sale debt securities, fair value | 3,118 | 2,577
Mortgage-backed Securities Non-agency | Residential mortgage-backed Securities |  |
Available-for-sale [Line Items] |  |
Securities available for sale debt securities, amortized cost | 1,515 | 1,924
Securities available for sale debt securities, unrealized gains | 302 | 300
Securities available for sale debt securities, unrealized losses | (3) | (13)
Securities available for sale debt securities, fair value | 1,814 | 2,211
Mortgage-backed Securities Non-agency | Commercial Mortgage Backed Securities |  |
Available-for-sale [Line Items] |  |
Securities available for sale debt securities, amortized cost | 3,352 | 2,689
Securities available for sale debt securities, unrealized gains | 29 | 5
Securities available for sale debt securities, unrealized losses | (9) | (37)
Securities available for sale debt securities, fair value | $ 3,372 | $ 2,657

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