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Components of Other Comprehensive Income (Loss) (Tables) | 6 Months Ended
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Jun. 30, 2021
Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Accumulated Other Comprehensive Income/(Loss) | The following table provides the changes in accumulated other comprehensive income (loss) by component, net of tax, for the three and six months ended June 30, 2021 and 2020:
(Dollars in millions) |  | Securities AFS |  | Cash Flow Hedges |  | Pension and Post-retirement Plans |  | Total
Balance as of April 1, 2021 |  | $ | 5 |  |  | $ | 10 |  |  | $ | (256) |  |  | $ | (241) |
Net unrealized gains (losses) |  | 38 |  |  | — |  |  | (4) |  |  | 34 |
Amounts reclassified from AOCI |  | — |  |  | (2) |  |  | 6 |  |  | 4 |
Other comprehensive income (loss) |  | 38 |  |  | (2) |  |  | 2 |  |  | 38 |
Balance as of June 30, 2021 |  | $ | 43 |  |  | $ | 8 |  |  | $ | (254) |  |  | $ | (203) |
(Dollars in millions) |  | Securities AFS |  | Cash Flow Hedges |  | Pension and Post-retirement Plans |  | Total
Balance as of January 1, 2021 |  | $ | 108 |  |  | $ | 12 |  |  | $ | (260) |  |  | $ | (140) |
Net unrealized gains (losses) |  | (65) |  |  | (1) |  |  | (5) |  |  | (71) |
Amounts reclassified from AOCI |  | — |  |  | (3) |  |  | 11 |  |  | 8 |
Other comprehensive income (loss) |  | (65) |  |  | (4) |  |  | 6 |  |  | (63) |
Balance as of June 30, 2021 |  | $ | 43 |  |  | $ | 8 |  |  | $ | (254) |  |  | $ | (203) |
(Dollars in millions) |  | Securities AFS |  | Cash Flow Hedges |  | Pension and Post-retirement Plans |  | Total
Balance as of April 1, 2020 |  | $ | 119 |  |  | $ | 16 |  |  | $ | (271) |  |  | $ | (136) |
Net unrealized gains (losses) |  | (1) |  |  | 2 |  |  | — |  |  | 1 |
Amounts reclassified from AOCI |  | — |  |  | (2) |  |  | 2 |  |  | — |
Other comprehensive income (loss) |  | (1) |  |  | — |  |  | 2 |  |  | 1 |
Balance as of June 30, 2020 |  | $ | 118 |  |  | $ | 16 |  |  | $ | (269) |  |  | $ | (135) |
(Dollars in millions) |  | Securities AFS |  | Cash Flow Hedges |  | Pension and Post-retirement Plans |  | Total
Balance as of January 1, 2020 |  | $ | 31 |  |  | $ | 3 |  |  | $ | (274) |  |  | $ | (240) |
Net unrealized gains (losses) |  | 87 |  |  | 15 |  |  | — |  |  | 102 |
Amounts reclassified from AOCI |  | — |  |  | (2) |  |  | 5 |  |  | 3 |
Other comprehensive income (loss) |  | 87 |  |  | 13 |  |  | 5 |  |  | 105 |
Balance as of June 30, 2020 |  | $ | 118 |  |  | $ | 16 |  |  | $ | (269) |  |  | $ | (135) |
Reclassification Out Of Accumulated Other Comprehensive Income | Reclassifications from AOCI, and related tax effects, were as follows:
(Dollars in millions) |  | Three Months Ended June 30, |  | Six Months Ended June 30, |  |
Details about AOCI |  | 2021 |  | 2020 |  | 2021 |  | 2020 |  | Affected line item in the statement where net income is presented
Cash Flow Hedges: |  |  |  |  |  |  |  |  |  |
Realized (gains) losses on cash flow hedges |  | $ | (2) |  |  | $ | (2) |  |  | $ | (4) |  |  | $ | (2) |  |  | Interest and fees on loans and leases
Tax expense (benefit) |  | — |  |  | — |  |  | 1 |  |  | — |  |  | Income tax expense
|  | (2) |  |  | (2) |  |  | (3) |  |  | (2) |  |  |
Pension and Postretirement Plans: |  |  |  |  |  |  |  |  |  |
Amortization of prior service cost and net actuarial gain (loss) |  | 5 |  |  | 3 |  |  | 9 |  |  | 6 |  |  | Other expense
Tax expense (benefit) |  | 1 |  |  | (1) |  |  | 2 |  |  | (1) |  |  | Income tax expense
|  | 6 |  |  | 2 |  |  | 11 |  |  | 5 |  |  |
Total reclassification from AOCI |  | $ | 4 |  |  | $ | — |  |  | $ | 8 |  |  | $ | 3 |  |  |

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