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Other Comprehensive Income | 12 Months Ended
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Dec. 31, 2020
Other Comprehensive Income [Abstract] |
Other Comprehensive Income | OTHER C OMPREHENSIVE I NCOMEDetails of other comprehensive income (loss) are as follows: Table 80: Other Comprehensive Income (Loss)
| Year ended December 31
| 2020 | 2019 | 2018
In millions | Pre-tax | Tax effect | After-tax | Pre-tax | Tax effect | After-tax | Pre-tax | Tax effect | After-tax
Debt securities |  |  |  |  |  |  |  |  |
Increase in net unrealized gains (losses) on securities | $ | 2,113 |  | $ | (485) |  | $ | 1,628 |  | $ | 1,529 |  | $ | (351) |  | $ | 1,178 |  | $ | (536) |  | $ | 123 |  | $ | (413) |
Less: Net realized gains (losses) reclassified to earnings (a) | 302 |  | (69) |  | 233 |  | 40 |  | (9) |  | 31 |  | 4 |  | (1) |  | 3 |
Net change | 1,811 |  | (416) |  | 1,395 |  | 1,489 |  | (342) |  | 1,147 |  | (540) |  | 124 |  | (416) |
Cash flow hedge derivatives |  |  |  |  |  |  |  |  |
Increase in net unrealized gains (losses) on cash flow hedge derivatives | 918 |  | (211) |  | 707 |  | 334 |  | (77) |  | 257 |  | (118) |  | 27 |  | (91) |
Less: Net realized gains (losses) reclassified to earnings (a) | 421 |  | (97) |  | 324 |  | 37 |  | (9) |  | 28 |  | 60 |  | (14) |  | 46 |
Net change | 497 |  | (114) |  | 383 |  | 297 |  | (68) |  | 229 |  | (178) |  | 41 |  | (137) |
Pension and other postretirement benefit plan adjustments |  |  |  |  |  |  |  |  |
Net pension and other postretirement benefit plan activity and other reclassified to earnings (b) | 82 |  | (19) |  | 63 |  | 158 |  | (36) |  | 122 |  | 16 |  | (4) |  | 12 |
Net change | 82 |  | (19) |  | 63 |  | 158 |  | (36) |  | 122 |  | 16 |  | (4) |  | 12 |
Other |  |  |  |  |  |  |  |  |
Net unrealized gains (losses) on other transactions | 10 |  | 5 |  | 15 |  | 17 |  | 5 |  | 22 |  | 18 |  | (17) |  | 1 |
Net change | 10 |  | 5 |  | 15 |  | 17 |  | 5 |  | 22 |  | 18 |  | (17) |  | 1 |
Total other comprehensive income (loss) from continuing operations | 2,400 |  | (544) |  | 1,856 |  | 1,961 |  | (441) |  | 1,520 |  | (684) |  | 144 |  | (540) |
Total other comprehensive income (loss) from discontinued operations | 148 |  | (33) |  | 115 |  | 5 |  | (1) |  | 4 |  | (55) |  | 12 |  | (43) |
Total other comprehensive income (loss) | $ | 2,548 |  | $ | (577) |  | $ | 1,971 |  | $ | 1,966 |  | $ | (442) |  | $ | 1,524 |  | $ | (739) |  | $ | 156 |  | $ | (583) |
(a)Reclassifications for pre-tax debt securities and cash flow hedges are recorded in interest income and noninterest income on the Consolidated Income Statement. (b)Reclassifications include amortization of actuarial losses (gains) and amortization of prior period services costs (credits) which are recorded in noninterest expense on the Consolidated Income Statement. Table 81: Accumulated Other Comprehensive Income (Loss) Components
In millions, after-tax | Debt securities |  | Cash flow hedge derivatives |  | Pension and other postretirement benefit plan adjustments |  | Other |  | Accumulated other Comprehensive Income from Continuing Operations |  | Accumulated other Comprehensive Income from Discontinued Operations |  | Total |
Balance at December 31, 2017 | $ | 277 |  |  | $ | 151 |  |  | $ | (446) |  |  | $ | (68) |  |  | $ | (86) |  |  | $ | (62) |  |  | $ | (148) |  |
Cumulative effect of adopting ASU 2018-02 (a) | 59 |  |  | 33 |  |  | (96) |  |  | 24 |  |  | 20 |  |  | (14) |  |  | 6 |  |
Balance at January 1, 2018 | 336 |  |  | 184 |  |  | (542) |  |  | (44) |  |  | (66) |  |  | (76) |  |  | (142) |  |
Net activity | (416) |  |  | (137) |  |  | 12 |  |  | 1 |  |  | (540) |  |  | (43) |  |  | (583) |  |
Balance at December 31, 2018 | $ | (80) |  |  | $ | 47 |  |  | $ | (530) |  |  | $ | (43) |  |  | $ | (606) |  |  | $ | (119) |  |  | $ | (725) |  |
Net activity | 1,147 |  |  | 229 |  |  | 122 |  |  | 22 |  |  | 1,520 |  |  | 4 |  |  | 1,524 |  |
Balance at December 31, 2019 | $ | 1,067 |  |  | $ | 276 |  |  | $ | (408) |  |  | $ | (21) |  |  | $ | 914 |  |  | $ | (115) |  |  | $ | 799 |  |
Net activity | 1,395 |  |  | 383 |  |  | 63 |  |  | 15 |  |  | 1,856 |  |  | 115 |  |  | 1,971 |  |
Balance at December 31, 2020 | $ | 2,462 |  |  | $ | 659 |  |  | $ | (345) |  |  | $ | (6) |  |  | $ | 2,770 |  |  |  |  | $ | 2,770 |  |
(a)Represents the cumulative impact of adopting ASU 2018-02 which permits the reclassification to retained earnings of the income tax effects stranded within AOCI.

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