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Investment Securities (Gross Unrealized Loss and Fair Value of Securities Available for Sale) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Debt Securities, Available-for-sale [Line Items] |  |
AFS unrealized loss position less than 12 months - unrealized loss | $ (33) | $ (126)
AFS unrealized loss position less than 12 months - fair value | 7,901 | 13,913
AFS unrealized loss position 12 months or more - unrealized loss | (65) | (709)
AFS unrealized loss position 12 months or more - fair value | 7,515 | 23,902
Total AFS unrealized loss | (98) | (835)
Total AFS fair Value | 15,416 | 37,815
HTM unrealized loss position less than 12 months - unrealized loss | (1) | (62)
HTM unrealized loss position less than 12 months - fair value | 22 | 4,506
HTM unrealized loss position 12 months or more - unrealized loss | (39) | (349)
HTM unrealized loss position 12 months or more - fair value | 3,065 | 8,490
Total HTM unrealized loss | (40) | (411)
Total HTM fair value | 3,087 | 12,996
US Treasury and Government Agencies Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
AFS unrealized loss position less than 12 months - unrealized loss | (14) | (21)
AFS unrealized loss position less than 12 months - fair value | 2,451 | 4,125
AFS unrealized loss position 12 months or more - unrealized loss | (2) | (116)
AFS unrealized loss position 12 months or more - fair value | 607 | 5,423
Total AFS unrealized loss | (16) | (137)
Total AFS fair Value | 3,058 | 9,548
HTM unrealized loss position 12 months or more - unrealized loss |  | (23)
HTM unrealized loss position 12 months or more - fair value |  | 446
Total HTM unrealized loss |  | (23)
Total HTM fair value |  | 446
Asset backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
AFS unrealized loss position less than 12 months - unrealized loss | (3) | (11)
AFS unrealized loss position less than 12 months - fair value | 660 | 2,149
AFS unrealized loss position 12 months or more - unrealized loss | (5) | (9)
AFS unrealized loss position 12 months or more - fair value | 561 | 1,032
Total AFS unrealized loss | (8) | (20)
Total AFS fair Value | 1,221 | 3,181
Other debt |  |
Debt Securities, Available-for-sale [Line Items] |  |
AFS unrealized loss position less than 12 months - unrealized loss |  | (12)
AFS unrealized loss position less than 12 months - fair value |  | 868
AFS unrealized loss position 12 months or more - unrealized loss | (1) | (26)
AFS unrealized loss position 12 months or more - fair value | 403 | 1,293
Total AFS unrealized loss | (1) | (38)
Total AFS fair Value | 403 | 2,161
HTM unrealized loss position less than 12 months - unrealized loss | (1) | (2)
HTM unrealized loss position less than 12 months - fair value | 22 | 75
HTM unrealized loss position 12 months or more - unrealized loss | (13) | (26)
HTM unrealized loss position 12 months or more - fair value | 105 | 123
Total HTM unrealized loss | (14) | (28)
Total HTM fair value | 127 | 198
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) | (57)
AFS unrealized loss position less than 12 months - fair value | 2,832 | 4,823
AFS unrealized loss position 12 months or more - unrealized loss | (37) | (467)
AFS unrealized loss position 12 months or more - fair value | 4,659 | 13,830
Total AFS unrealized loss | (43) | (524)
Total AFS fair Value | 7,491 | 18,653
HTM unrealized loss position less than 12 months - unrealized loss |  | (58)
HTM unrealized loss position less than 12 months - fair value |  | 4,191
HTM unrealized loss position 12 months or more - unrealized loss | (26) | (300)
HTM unrealized loss position 12 months or more - fair value | 2,960 | 7,921
Total HTM unrealized loss | (26) | (358)
Total HTM fair value | 2,960 | 12,112
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) | (1)
AFS unrealized loss position less than 12 months - fair value | 852 | 65
AFS unrealized loss position 12 months or more - unrealized loss | (12) | (65)
AFS unrealized loss position 12 months or more - fair value | 953 | 1,516
Total AFS unrealized loss | (18) | (66)
Total AFS fair Value | 1,805 | 1,581
HTM unrealized loss position less than 12 months - unrealized loss |  | (1)
HTM unrealized loss position less than 12 months - fair value |  | 88
Total HTM unrealized loss |  | (1)
Total HTM fair value |  | 88
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 |  | (1)
AFS unrealized loss position less than 12 months - fair value |  | 74
AFS unrealized loss position 12 months or more - unrealized loss | (3) | (12)
AFS unrealized loss position 12 months or more - fair value | 102 | 310
Total AFS unrealized loss | (3) | (13)
Total AFS fair Value | 102 | 384
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) | (23)
AFS unrealized loss position less than 12 months - fair value | 1,106 | 1,809
AFS unrealized loss position 12 months or more - unrealized loss | (5) | (14)
AFS unrealized loss position 12 months or more - fair value | 230 | 498
Total AFS unrealized loss | (9) | (37)
Total AFS fair Value | $ 1,336 | 2,307
HTM unrealized loss position less than 12 months - unrealized loss |  | (1)
HTM unrealized loss position less than 12 months - fair value |  | 152
Total HTM unrealized loss |  | (1)
Total HTM fair value |  | $ 152

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