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Other Comprehensive Income (Other Comprehensive Income) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Net Unrealized Gains Losses on Non Otti Securities [Abstract] |  |  |
Increase in net unrealized gains(losses) on non-OTTI securities | $ 1,505 | $ (522) | $ 29
Less: Net gains (losses) realized as a yield adjustment reclassified to investment securities in interest income, before tax | 11 | 12 | 25
Less: Net gains (losses) realized on sales of non-OTTI securities reclassified to noninterest income, before tax | 29 | (8) | (12)
Net increase (decrease), pre-tax | 1,465 | (526) | 16
Effect of income taxes | (337) | 121 | (6)
Net unrealized gains (losses) on non-OTTI securities, Activity, After Tax | 1,128 | (405) | 10
Net Unrealized Gains Losses On Otti Securities [Abstract] |  |  |
Increase in net unrealized gains (losses) on OTTI securities, Pretax | 24 | (14) | 173
Less: Net gains (losses) realized on sales of securities reclassified to noninterest income |  |  | 2
Less: OTTI losses realized on securities reclassified to noninterest income |  |  | (1)
Net unrealized gains (losses) on OTTI securities | 24 | (14) | 172
Effect of income taxes | (5) | 3 | (63)
Net unrealized gains (losses) on OTTI securities, Activity, After Tax | 19 | (11) | 109
Net unrealized gains (losses) on cash flow hedge derivatives [Abstract] |  |  |
Increase in net unrealized gains (losses) on cash flow hedge derivatives | 334 | (118) |
Less: Net gains (losses) realized as a yield adjustment reclassified to loan interest income | 9 | 41 |
Less: Net gains (losses) realized as a yield adjustment reclassified to investment securities interest income | 9 | 11 |
Less: Net gains (losses) realized on sales of securities reclassified to noninterest income | 19 | 8 |
Net unrealized gains (losses) on cash flow hedge derivatives | 297 | (178) |
Effect of income taxes | (68) | 41 |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax | 229 | (137) |
Increase in net unrealized gains (losses) on cash flow hedge derivatives |  |  | (90)
Less: Net gains (losses) realized as a yield adjustment reclassified to loan interest income, Before Tax |  |  | 159
Less: Net gains (losses) realized as a yield adjustment reclassified to investment securities interest income, Before Tax |  |  | 21
Less: Net gains (losses) realized on sales of securities reclassified to noninterest income, Before Tax |  |  | 17
Net unrealized gains (losses) on cash flow hedge derivatives |  |  | (287)
Effect of income taxes |  |  | 105
Net unrealized gains (losses) on cash flow hedge derivatives, Net of tax, Total |  |  | (182)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax [Abstract] |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax | 146 | 10 | 126
Amortization of actuarial loss (gain) reclassified to other noninterest expense, Before tax | 8 | 5 | 47
Amortization of prior service cost (credit) reclassified to other noninterest expense, Before tax | 4 | 1 | (4)
Pension and other postretirement benefit plan adjustments, net activity, Pre-Tax | 158 | 16 | 169
Effect of income taxes | (36) | (4) | (62)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | 122 | 12 | 107
Other Comprehensive Income Other Adjustments [Abstract] |  |  |
Net investment hedge derivatives, Before tax | (24) | 76 | (81)
Foreign Currency Transaction and Translation Adjustment, before Tax | 41 | (58) | 90
Total Other, net activity, Before tax | 17 | 18 | 9
Effect of income taxes | 5 | (17) | 29
Total Other, net activity, After tax | 22 | 1 | 38
Income tax benefit (expense) related to items of other comprehensive income | (441) | 144 | 3
Other comprehensive income (loss), after tax and net of reclassifications into Net income | 1,524 | (583) | 117
Continuing Operations |  |  |
Other Comprehensive Income Other Adjustments [Abstract] |  |  |
Other comprehensive income (loss), before tax and net of reclassifications into Net income | 1,961 | (684) | 79
Income tax benefit (expense) related to items of other comprehensive income | (441) | 144 | 3
Other comprehensive income (loss), after tax and net of reclassifications into Net income | 1,520 | (540) | 82
Discontinued Operations |  |  |
Other Comprehensive Income Other Adjustments [Abstract] |  |  |
Other comprehensive income (loss), after tax and net of reclassifications into Net income | $ 4 | $ (43) | $ 35

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