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Investment Securities - (Tables) | 12 Months Ended
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Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract] |
Investment Securities Summary | Table 47: Investment Securities Summary
|  | December 31, 2019 |  |  | December 31, 2018
In millions |  | Amortized Cost |  |  | Unrealized |  | Fair Value |  |  |  | Amortized Cost |  |  | Unrealized |  | Fair Value |
Gains |  |  | Losses |  |  |  |  | Gains |  |  | Losses |  |
Securities Available for Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and government agencies |  | $ | 16,150 |  |  | $ | 382 |  |  | $ | (16 | ) |  | $ | 16,516 |  |  |  | $ | 18,104 |  |  | $ | 133 |  |  | $ | (137 | ) |  | $ | 18,100 |
Residential mortgage-backed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency |  | 35,847 |  |  | 517 |  |  | (43 | ) |  | 36,321 |  |  |  | 29,413 |  |  | 104 |  |  | (524 | ) |  | 28,993 |
Non-agency |  | 1,515 |  |  | 302 |  |  | (3 | ) |  | 1,814 |  |  |  | 1,924 |  |  | 300 |  |  | (13 | ) |  | 2,211 |
Commercial mortgage-backed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency |  | 3,094 |  |  | 42 |  |  | (18 | ) |  | 3,118 |  |  |  | 2,630 |  |  | 13 |  |  | (66 | ) |  | 2,577 |
Non-agency |  | 3,352 |  |  | 29 |  |  | (9 | ) |  | 3,372 |  |  |  | 2,689 |  |  | 5 |  |  | (37 | ) |  | 2,657 |
Asset-backed |  | 5,044 |  |  | 78 |  |  | (8 | ) |  | 5,114 |  |  |  | 4,933 |  |  | 59 |  |  | (20 | ) |  | 4,972 |
Other |  | 2,788 |  |  | 121 |  |  | (1 | ) |  | 2,908 |  |  |  | 3,821 |  |  | 96 |  |  | (38 | ) |  | 3,879 |
Total securities available for sale |  | $ | 67,790 |  |  | $ | 1,471 |  |  | $ | (98 | ) |  | $ | 69,163 |  |  |  | $ | 63,514 |  |  | $ | 710 |  |  | $ | (835 | ) |  | $ | 63,389 |
Securities Held to Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and government agencies |  | $ | 776 |  |  | $ | 56 |  |  |  |  | $ | 832 |  |  |  | $ | 758 |  |  | $ | 28 |  |  | $ | (23 | ) |  | $ | 763 |
Residential mortgage-backed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency |  | 14,419 |  |  | 270 |  |  | (26 | ) |  | 14,663 |  |  |  | 15,740 |  |  | 32 |  |  | (358 | ) |  | 15,414 |
Non-agency |  | 133 |  |  | 7 |  |  |  |  | 140 |  |  |  | 152 |  |  | 2 |  |  |  |  | 154 |
Commercial mortgage-backed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency |  | 59 |  |  | 1 |  |  |  |  | 60 |  |  |  | 143 |  |  | 1 |  |  | (1 | ) |  | 143 |
Non-agency |  | 430 |  |  | 4 |  |  |  |  | 434 |  |  |  | 488 |  |  | 1 |  |  | (1 | ) |  | 488 |
Asset-backed |  | 52 |  |  |  |  |  |  |  | 52 |  |  |  | 182 |  |  | 1 |  |  |  |  | 183 |
Other |  | 1,792 |  |  | 85 |  |  | (14 | ) |  | 1,863 |  |  |  | 1,849 |  |  | 53 |  |  | (28 | ) |  | 1,874 |
Total securities held to maturity |  | $ | 17,661 |  |  | $ | 423 |  |  | $ | (40 | ) |  | $ | 18,044 |  |  |  | $ | 19,312 |  |  | $ | 118 |  |  | $ | (411 | ) |  | $ | 19,019 |
Gross Unrealized Loss and Fair Value of Securities Available for Sale | Table 48: Gross Unrealized Loss and Fair Value of Debt Securities
|  | Unrealized loss position less than 12 months |  | Unrealized loss position 12 months or more |  | Total
In millions |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |
December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |
Securities Available for Sale |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and government agencies |  | $ | (14 | ) |  | $ | 2,451 |  |  | $ | (2 | ) |  | $ | 607 |  |  | $ | (16 | ) |  | $ | 3,058 |
Residential mortgage-backed |  |  |  |  |  |  |  |  |  |  |  |
Agency |  | (6 | ) |  | 2,832 |  |  | (37 | ) |  | 4,659 |  |  | (43 | ) |  | 7,491 |
Non-agency |  |  |  |  |  | (3 | ) |  | 102 |  |  | (3 | ) |  | 102 |
Commercial mortgage-backed |  |  |  |  |  |  |  |  |  |  |  |
Agency |  | (6 | ) |  | 852 |  |  | (12 | ) |  | 953 |  |  | (18 | ) |  | 1,805 |
Non-agency |  | (4 | ) |  | 1,106 |  |  | (5 | ) |  | 230 |  |  | (9 | ) |  | 1,336 |
Asset-backed |  | (3 | ) |  | 660 |  |  | (5 | ) |  | 561 |  |  | (8 | ) |  | 1,221 |
Other |  |  |  |  |  | (1 | ) |  | 403 |  |  | (1 | ) |  | 403 |
Total securities available for sale |  | $ | (33 | ) |  | $ | 7,901 |  |  | $ | (65 | ) |  | $ | 7,515 |  |  | $ | (98 | ) |  | $ | 15,416 |
Securities Held to Maturity |  |  |  |  |  |  |  |  |  |  |  |
Residential mortgage-backed - Agency |  |  |  |  |  | (26 | ) |  | 2,960 |  |  | (26 | ) |  | 2,960 |
Other |  | (1 | ) |  | 22 |  |  | (13 | ) |  | 105 |  |  | (14 | ) |  | 127 |
Total securities held to maturity |  | $ | (1 | ) |  | $ | 22 |  |  | $ | (39 | ) |  | $ | 3,065 |  |  | $ | (40 | ) |  | $ | 3,087 |
December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |
Securities Available for Sale |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and government agencies |  | $ | (21 | ) |  | $ | 4,125 |  |  | $ | (116 | ) |  | $ | 5,423 |  |  | $ | (137 | ) |  | $ | 9,548 |
Residential mortgage-backed |  |  |  |  |  |  |  |  |  |  |  |
Agency |  | (57 | ) |  | 4,823 |  |  | (467 | ) |  | 13,830 |  |  | (524 | ) |  | 18,653 |
Non-agency |  | (1 | ) |  | 74 |  |  | (12 | ) |  | 310 |  |  | (13 | ) |  | 384 |
Commercial mortgage-backed |  |  |  |  |  |  |  |  |  |  |  |
Agency |  | (1 | ) |  | 65 |  |  | (65 | ) |  | 1,516 |  |  | (66 | ) |  | 1,581 |
Non-agency |  | (23 | ) |  | 1,809 |  |  | (14 | ) |  | 498 |  |  | (37 | ) |  | 2,307 |
Asset-backed |  | (11 | ) |  | 2,149 |  |  | (9 | ) |  | 1,032 |  |  | (20 | ) |  | 3,181 |
Other |  | (12 | ) |  | 868 |  |  | (26 | ) |  | 1,293 |  |  | (38 | ) |  | 2,161 |
Total securities available for sale |  | $ | (126 | ) |  | $ | 13,913 |  |  | $ | (709 | ) |  | $ | 23,902 |  |  | $ | (835 | ) |  | $ | 37,815 |
Securities Held to Maturity |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and government agencies |  |  |  |  |  |  |  | $ | (23 | ) |  | $ | 446 |  |  | $ | (23 | ) |  | $ | 446 |
Residential mortgage-backed - Agency |  | $ | (58 | ) |  | $ | 4,191 |  |  | (300 | ) |  | 7,921 |  |  | (358 | ) |  | 12,112 |
Commercial mortgage-backed |  |  |  |  |  |  |  |  |  |  |  |
Agency |  | (1 | ) |  | 88 |  |  |  |  |  |  |  |  | (1 | ) |  | 88 |
Non-agency |  | (1 | ) |  | 152 |  |  |  |  |  |  | (1 | ) |  | 152 |
Other |  | (2 | ) |  | 75 |  |  | (26 | ) |  | 123 |  |  | (28 | ) |  | 198 |
Total securities held to maturity |  | $ | (62 | ) |  | $ | 4,506 |  |  | $ | (349 | ) |  | $ | 8,490 |  |  | $ | (411 | ) |  | $ | 12,996 |
Gains (losses) on Sales Of Securities Available for Sale | Table 49: Gains (Losses) on Sales of Securities Available for Sale
Year ended December 31 In millions | Gross Gains |  |  | Gross Losses |  |  | Net Gains |  |  | Tax Expense |  |
2019 | $ | 69 |  |  | $ | (21 | ) |  | $ | 48 |  |  | $ | 10 |  |
2018 | $ | 57 |  |  | $ | (57 | ) |  |  |  |  |  |  |
2017 | $ | 38 |  |  | $ | (31 | ) |  | $ | 7 |  |  | $ | 2 |  |
Contractual Maturity of Securities | Table 50: Contractual Maturity of Securities
December 31, 2019 |  | 1 Year or Less |  |  | After 1 Year through 5 Years |  |  | After 5 Years through 10 Years |  |  | After 10 Years |  |  | Total |
Dollars in millions |  |  |  |  |
Securities Available for Sale |  |  |  |  |  |  |  |  |  |
U.S. Treasury and government agencies |  | $ | 2,198 |  |  | $ | 10,189 |  |  | $ | 2,984 |  |  | $ | 779 |  |  | $ | 16,150 |
Residential mortgage-backed |  |  |  |  |  |  |  |  |  |
Agency |  | 2 |  |  | 65 |  |  | 1,194 |  |  | 34,586 |  |  | 35,847 |
Non-agency |  |  |  |  |  |  |  | 1,515 |  |  | 1,515 |
Commercial mortgage-backed |  |  |  |  |  |  |  |  |  |
Agency |  | 8 |  |  | 565 |  |  | 490 |  |  | 2,031 |  |  | 3,094 |
Non-agency |  |  |  | 75 |  |  | 350 |  |  | 2,927 |  |  | 3,352 |
Asset-backed |  | 8 |  |  | 2,511 |  |  | 1,267 |  |  | 1,258 |  |  | 5,044 |
Other |  | 337 |  |  | 1,314 |  |  | 486 |  |  | 651 |  |  | 2,788 |
Total securities available for sale at amortized cost |  | $ | 2,553 |  |  | $ | 14,719 |  |  | $ | 6,771 |  |  | $ | 43,747 |  |  | $ | 67,790 |
Fair value |  | $ | 2,573 |  |  | $ | 14,881 |  |  | $ | 6,924 |  |  | $ | 44,785 |  |  | $ | 69,163 |
Weighted-average yield, GAAP basis |  | 2.94 | % |  | 2.28 | % |  | 2.66 | % |  | 3.19 | % |  | 2.93 | %
Securities Held to Maturity |  |  |  |  |  |  |  |  |  |
U.S. Treasury and government agencies |  |  |  | $ | 198 |  |  | $ | 300 |  |  | $ | 278 |  |  | $ | 776 |
Residential mortgage-backed |  |  |  |  |  |  |  |  |  |
Agency |  |  |  | 55 |  |  | 516 |  |  | 13,848 |  |  | 14,419 |
Non-agency |  |  |  |  |  |  |  | 133 |  |  | 133 |
Commercial mortgage-backed |  |  |  |  |  |  |  |  |  |
Agency |  |  |  | 10 |  |  |  |  | 49 |  |  | 59 |
Non-agency |  |  |  |  |  |  |  | 430 |  |  | 430 |
Asset-backed |  |  |  | 6 |  |  | 19 |  |  | 27 |  |  | 52 |
Other |  | $ | 45 |  |  | 785 |  |  | 625 |  |  | 337 |  |  | 1,792 |
Total securities held to maturity at amortized cost |  | $ | 45 |  |  | $ | 1,054 |  |  | $ | 1,460 |  |  | $ | 15,102 |  |  | $ | 17,661 |
Fair value |  | $ | 45 |  |  | $ | 1,089 |  |  | $ | 1,543 |  |  | $ | 15,367 |  |  | $ | 18,044 |
Weighted-average yield, GAAP basis |  | 3.75 | % |  | 3.59 | % |  | 3.53 | % |  | 3.32 | % |  | 3.35 | %
Fair Value of Securities Pledged and Accepted as Collateral | Table 51: Fair Value of Securities Pledged and Accepted as Collateral
In millions | December 31 2019 |  |  | December 31 2018 |
Pledged to others | $ | 14,609 |  |  | $ | 7,597 |
Accepted from others: |  |  |
Permitted by contract or custom to sell or repledge (a) | $ | 2,349 |  |  | $ | 6,905 |
Permitted amount repledged to others | $ | 360 |  |  | $ | 923 |
(a) Includes $2.0 billion and $6.0 billion in fair value of securities accepted from others to collateralize short-term investments in resale agreements that were not repledged to others at December 31, 2019 and December 31, 2018, respectively.

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