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Investment Securities (Gross Unrealized Loss and Fair Value of Debt Securities ) (Details) $ in Millions | Dec. 31, 2019 USD ($)
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Debt Securities, Available-for-sale [Line Items] |
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months, accumulated loss | $ (33)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 7,901
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss | (65)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 7,515
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (98)
Debt securities, available-for-sale, unrealized loss position | 15,416
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract] |
HTM unrealized loss position less than 12 months - unrealized loss | (1)
HTM unrealized loss position less than 12 months - fair value | 22
HTM unrealized loss position 12 months or more - unrealized loss | (39)
HTM unrealized loss position 12 months or more - fair value | 3,065
Total HTM unrealized loss | (40)
Total HTM fair value | 3,087
US Treasury and Government [Member] |
Debt Securities, Available-for-sale [Line Items] |
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months, accumulated loss | (14)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 2,451
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss | (2)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 607
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (16)
Debt securities, available-for-sale, unrealized loss position | 3,058
Residential Mortgage-backed Securities [Member] | Mortgage-backed Securities Agency [Member] |
Debt Securities, Available-for-sale [Line Items] |
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months, accumulated loss | (6)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 2,832
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss | (37)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 4,659
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (43)
Debt securities, available-for-sale, unrealized loss position | 7,491
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract] |
HTM unrealized loss position less than 12 months - unrealized loss |
HTM unrealized loss position less than 12 months - fair value |
HTM unrealized loss position 12 months or more - unrealized loss | (26)
HTM unrealized loss position 12 months or more - fair value | 2,960
Total HTM unrealized loss | (26)
Total HTM fair value | 2,960
Residential Mortgage-backed Securities [Member] | Mortgage-backed Securities Non-agency [Member] |
Debt Securities, Available-for-sale [Line Items] |
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months, accumulated loss |
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value |
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss | (3)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 102
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (3)
Debt securities, available-for-sale, unrealized loss position | 102
Commercial Mortgage Backed Securities [Member] | Mortgage-backed Securities Agency [Member] |
Debt Securities, Available-for-sale [Line Items] |
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months, accumulated loss | (6)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 852
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss | (12)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 953
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (18)
Debt securities, available-for-sale, unrealized loss position | 1,805
Commercial Mortgage Backed Securities [Member] | Mortgage-backed Securities Non-agency [Member] |
Debt Securities, Available-for-sale [Line Items] |
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months, accumulated loss | (4)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 1,106
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss | (5)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 230
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (9)
Debt securities, available-for-sale, unrealized loss position | 1,336
Asset backed [Member] |
Debt Securities, Available-for-sale [Line Items] |
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months, accumulated loss | (3)
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value | 660
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss | (5)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 561
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (8)
Debt securities, available-for-sale, unrealized loss position | 1,221
Other [Member] |
Debt Securities, Available-for-sale [Line Items] |
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months, accumulated loss |
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months - fair value |
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss | (1)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer - fair value | 403
Debt securities, available-for-sale, unrealized loss position, accumulated loss | (1)
Debt securities, available-for-sale, unrealized loss position | 403
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract] |
HTM unrealized loss position less than 12 months - unrealized loss | (1)
HTM unrealized loss position less than 12 months - fair value | 22
HTM unrealized loss position 12 months or more - unrealized loss | (13)
HTM unrealized loss position 12 months or more - fair value | 105
Total HTM unrealized loss | (14)
Total HTM fair value | $ 127

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