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Investment Securities (Gross Unrealized Loss and Fair Value of Securities Available for Sale) (Details) $ in Millions | Dec. 31, 2019 USD ($)
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Debt Securities, Available-for-sale [Line Items] |
AFS unrealized loss position less than 12 months - unrealized loss | $ (33)
AFS unrealized loss position less than 12 months - fair value | 7,901
AFS unrealized loss position 12 months or more - unrealized loss | (65)
AFS unrealized loss position 12 months or more - fair value | 7,515
Total AFS unrealized loss | (98)
Total AFS fair Value | 15,416
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
U.S. Treasury and government agencies |
Debt Securities, Available-for-sale [Line Items] |
AFS unrealized loss position less than 12 months - unrealized loss | (14)
AFS unrealized loss position less than 12 months - fair value | 2,451
AFS unrealized loss position 12 months or more - unrealized loss | (2)
AFS unrealized loss position 12 months or more - fair value | 607
Total AFS unrealized loss | (16)
Total AFS fair Value | 3,058
Asset-backed |
Debt Securities, Available-for-sale [Line Items] |
AFS unrealized loss position less than 12 months - unrealized loss | (3)
AFS unrealized loss position less than 12 months - fair value | 660
AFS unrealized loss position 12 months or more - unrealized loss | (5)
AFS unrealized loss position 12 months or more - fair value | 561
Total AFS unrealized loss | (8)
Total AFS fair Value | 1,221
Other debt |
Debt Securities, Available-for-sale [Line Items] |
AFS unrealized loss position less than 12 months - unrealized loss |
AFS unrealized loss position less than 12 months - fair value |
AFS unrealized loss position 12 months or more - unrealized loss | (1)
AFS unrealized loss position 12 months or more - fair value | 403
Total AFS unrealized loss | (1)
Total AFS fair Value | 403
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
Mortgage-backed Securities Agency | Residential mortgage-backed Securities |
Debt Securities, Available-for-sale [Line Items] |
AFS unrealized loss position less than 12 months - unrealized loss | (6)
AFS unrealized loss position less than 12 months - fair value | 2,832
AFS unrealized loss position 12 months or more - unrealized loss | (37)
AFS unrealized loss position 12 months or more - fair value | 4,659
Total AFS unrealized loss | (43)
Total AFS fair Value | 7,491
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
Mortgage-backed Securities Agency | Commercial Mortgage Backed Securities |
Debt Securities, Available-for-sale [Line Items] |
AFS unrealized loss position less than 12 months - unrealized loss | (6)
AFS unrealized loss position less than 12 months - fair value | 852
AFS unrealized loss position 12 months or more - unrealized loss | (12)
AFS unrealized loss position 12 months or more - fair value | 953
Total AFS unrealized loss | (18)
Total AFS fair Value | 1,805
Mortgage-backed Securities Non-agency | Residential mortgage-backed Securities |
Debt Securities, Available-for-sale [Line Items] |
AFS unrealized loss position less than 12 months - unrealized loss |
AFS unrealized loss position less than 12 months - fair value |
AFS unrealized loss position 12 months or more - unrealized loss | (3)
AFS unrealized loss position 12 months or more - fair value | 102
Total AFS unrealized loss | (3)
Total AFS fair Value | 102
Mortgage-backed Securities Non-agency | Commercial Mortgage Backed Securities |
Debt Securities, Available-for-sale [Line Items] |
AFS unrealized loss position less than 12 months - unrealized loss | (4)
AFS unrealized loss position less than 12 months - fair value | 1,106
AFS unrealized loss position 12 months or more - unrealized loss | (5)
AFS unrealized loss position 12 months or more - fair value | 230
Total AFS unrealized loss | (9)
Total AFS fair Value | $ 1,336

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