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Investment Securities (Summary) (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2020 | Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items] |  |
Securities available for sale debt securities, amortized cost | $ 93,661 | $ 67,790
Securities available for sale debt securities, unrealized gains | 3,613 | 1,471
Securities available for sale debt securities, unrealized losses | (222) | (98)
Investment securities – available for sale | 97,052 | 69,163
Held to maturity securities, amortized cost | 1,441 | 17,661
Held-to-maturity securities, unrealized gains | 188 | 423
Held-to-maturity securities, unrealized losses | (14) | (40)
Held-to-maturity securities, fair value | 1,615 | 18,044
Debt securities, available-for-sale, accrued interest | 270 |
Debt securities, held-to-maturity, accrued interest | 5 |
Debt securities, available-for-sale, allowance for credit loss | 30 |
Debt securities, held-to-maturity, allowance for credit loss | $ 2 |
Credit Concentration Risk [Member] | Fitch, AAA or AA Rating [Member] |  |
Debt Securities, Held-to-maturity [Abstract] |  |
Concentration risk, percentage | 84.00% |
US Treasury and Government [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities available for sale debt securities, amortized cost | $ 19,255 | 16,150
Securities available for sale debt securities, unrealized gains | 933 | 382
Securities available for sale debt securities, unrealized losses |  | (16)
Investment securities – available for sale | 20,188 | 16,516
Held to maturity securities, amortized cost | 785 | 776
Held-to-maturity securities, unrealized gains | 146 | 56
Held-to-maturity securities, fair value | 931 | 832
Residential Mortgage-backed Securities [Member] | Mortgage-backed Securities Agency [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities available for sale debt securities, amortized cost | 55,630 | 35,847
Securities available for sale debt securities, unrealized gains | 1,860 | 517
Securities available for sale debt securities, unrealized losses | (10) | (43)
Investment securities – available for sale | 57,480 | 36,321
Held to maturity securities, amortized cost |  | 14,419
Held-to-maturity securities, unrealized gains |  | 270
Held-to-maturity securities, unrealized losses |  | (26)
Held-to-maturity securities, fair value |  | 14,663
Residential Mortgage-backed Securities [Member] | Mortgage-backed Securities Non-agency [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities available for sale debt securities, amortized cost | 1,472 | 1,515
Securities available for sale debt securities, unrealized gains | 225 | 302
Securities available for sale debt securities, unrealized losses | (15) | (3)
Investment securities – available for sale | 1,682 | 1,814
Held to maturity securities, amortized cost |  | 133
Held-to-maturity securities, unrealized gains |  | 7
Held-to-maturity securities, fair value |  | 140
Commercial Mortgage Backed Securities [Member] | Mortgage-backed Securities Agency [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities available for sale debt securities, amortized cost | 3,002 | 3,094
Securities available for sale debt securities, unrealized gains | 141 | 42
Securities available for sale debt securities, unrealized losses | (3) | (18)
Investment securities – available for sale | 3,140 | 3,118
Held to maturity securities, amortized cost |  | 59
Held-to-maturity securities, unrealized gains |  | 1
Held-to-maturity securities, fair value |  | 60
Commercial Mortgage Backed Securities [Member] | Mortgage-backed Securities Non-agency [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities available for sale debt securities, amortized cost | 4,134 | 3,352
Securities available for sale debt securities, unrealized gains | 57 | 29
Securities available for sale debt securities, unrealized losses | (152) | (9)
Investment securities – available for sale | 4,039 | 3,372
Held to maturity securities, amortized cost |  | 430
Held-to-maturity securities, unrealized gains |  | 4
Held-to-maturity securities, fair value |  | 434
Asset-backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities available for sale debt securities, amortized cost | 5,312 | 5,044
Securities available for sale debt securities, unrealized gains | 96 | 78
Securities available for sale debt securities, unrealized losses | (40) | (8)
Investment securities – available for sale | 5,368 | 5,114
Held to maturity securities, amortized cost |  | 52
Held-to-maturity securities, fair value |  | 52
Other [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities available for sale debt securities, amortized cost | 4,856 | 2,788
Securities available for sale debt securities, unrealized gains | 301 | 121
Securities available for sale debt securities, unrealized losses | (2) | (1)
Investment securities – available for sale | 5,155 | 2,908
Held to maturity securities, amortized cost | 656 | 1,792
Held-to-maturity securities, unrealized gains | 42 | 85
Held-to-maturity securities, unrealized losses | (14) | (14)
Held-to-maturity securities, fair value | $ 684 | $ 1,863

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