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Components of Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2023
Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) | The following table provides the changes in accumulated other comprehensive income (loss) by component, net of tax, for the years ended December 31, 2023, 2022, and 2021: Table 8.13.1 ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
(Dollars in millions) |  | Securities AFS |  | Cash Flow Hedges |  | Pension and Post-retirement Plans |  | Total
Balance as of December 31, 2020 |  | $ | 108 |  |  | $ | 12 |  |  | $ | (260) |  |  | $ | (140) |
Net unrealized gains (losses) |  | (144) |  |  | (3) |  |  | (2) |  |  | (149) |
Amounts reclassified from AOCI |  | — |  |  | (7) |  |  | 8 |  |  | 1 |
Other comprehensive income (loss) |  | (144) |  |  | (10) |  |  | 6 |  |  | (148) |
Balance as of December 31, 2021 |  | $ | (36) |  |  | $ | 2 |  |  | $ | (254) |  |  | $ | (288) |
Net unrealized gains (losses) |  | (937) |  |  | (144) |  |  | (22) |  |  | (1,103) |
Amounts reclassified from AOCI |  | — |  |  | 15 |  |  | 8 |  |  | 23 |
Other comprehensive income (loss) |  | (937) |  |  | (129) |  |  | (14) |  |  | (1,080) |
Balance as of December 31, 2022 |  | $ | (973) |  |  | $ | (127) |  |  | $ | (268) |  |  | $ | (1,368) |
Net unrealized gains (losses) |  | 137 |  |  | (5) |  |  | (11) |  |  | 121 |
Amounts reclassified from AOCI |  | — |  |  | 52 |  |  | 7 |  |  | 59 |
Other comprehensive income (loss) |  | 137 |  |  | 47 |  |  | (4) |  |  | 180 |
Balance as of December 31, 2023 |  | $ | (836) |  |  | $ | (80) |  |  | $ | (272) |  |  | $ | (1,188) |
Schedule of Reclassification Out of Accumulated Other Comprehensive Income | Reclassifications from AOCI, and related tax effects, were as follows: Table 8.13.2 RECLASSIFICATIONS FROM AOCI
(Dollars in millions) |  |  |  |
Details about AOCI |  | 2023 |  | 2022 |  | 2021 |  | Affected line item in the statement where net income is presented
Cash flow hedges: |  |  |  |  |  |  |  |
Realized (gains) losses on cash flow hedges |  | $ | 69 |  |  | $ | 20 |  |  | $ | (9) |  |  | Interest and fees on loans and leases
Tax expense (benefit) |  | (17) |  |  | (5) |  |  | 2 |  |  | Income tax expense
|  | $ | 52 |  |  | $ | 15 |  |  | $ | (7) |  |  |
Pension and Postretirement Plans: |  |  |  |  |  |  |  |
Amortization of prior service cost and net actuarial (gain) loss |  | $ | 9 |  |  | $ | 10 |  |  | $ | 10 |  |  | Other expense
Tax expense (benefit) |  | (2) |  |  | (2) |  |  | (2) |  |  | Income tax expense
|  | 7 |  |  | 8 |  |  | 8 |  |  |
Total reclassification from AOCI |  | $ | 59 |  |  | $ | 23 |  |  | $ | 1 |  |  |

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