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Accumulated Other Comprehensive (Loss) Income (Tables) | 12 Months Ended
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Dec. 31, 2022
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive (Loss) Income | The following table details the components of accumulated other comprehensive (loss) income: Components of Accumulated Other Comprehensive (Loss) Income
dollars in millions | December 31, 2022 |  | December 31, 2021
| Pretax |  | Income Taxes |  | Net of Income Taxes |  | Pretax |  | Income Taxes |  | Net of Income Taxes
Unrealized loss on securities available for sale | $ | (972) |  |  | $ | 233 |  |  | $ | (739) |  |  | $ | (12) |  |  | $ | 3 |  |  | $ | (9) |
Unrealized loss on securities available for sale transferred to securities held to maturity | (8) |  |  | 2 |  |  | (6) |  |  | (9) |  |  | 2 |  |  | (7) |
Defined benefit pension items | 13 |  |  | (3) |  |  | 10 |  |  | 34 |  |  | (8) |  |  | 26 |
Total accumulated other comprehensive (loss) income | $ | (967) |  |  | $ | 232 |  |  | $ | (735) |  |  | $ | 13 |  |  | $ | (3) |  |  | $ | 10 |
The following table details the changes in the components of accumulated other comprehensive (loss) income, net of income tax: Changes in Components of Accumulated Other Comprehensive (Loss) Income, net of income tax
dollars in millions | Unrealized (loss) gain on securities available for sale |  | Unrealized (loss) gain on securities available for sale transferred to securities held to maturity |  | Net change in defined benefit pension items |  |  |  | Total accumulated other comprehensive (loss) income
Balance as of December 31, 2021 | $ | (9) |  |  | $ | (7) |  |  | $ | 26 |  |  |  |  | $ | 10 |
AOCI activity before reclassifications | (730) |  |  | — |  |  | (25) |  |  |  |  | (755) |
Amounts reclassified from AOCI | — |  |  | 1 |  |  | 9 |  |  |  |  | 10 |
Other comprehensive (loss) income for the period | (730) |  |  | 1 |  |  | (16) |  |  |  |  | (745) |
Balance as of December 31, 2022 | $ | (739) |  |  | $ | (6) |  |  | $ | 10 |  |  |  |  | $ | (735) |
Balance as of December 31, 2020 | $ | 79 |  |  | $ | 4 |  |  | $ | (71) |  |  |  |  | $ | 12 |
AOCI activity before reclassifications | (62) |  |  | (10) |  |  | 76 |  |  |  |  | 4 |
Amounts reclassified from AOCI | (26) |  |  | (1) |  |  | 21 |  |  |  |  | (6) |
Other comprehensive (loss) income for the period | (88) |  |  | (11) |  |  | 97 |  |  |  |  | (2) |
Balance as of December 31, 2021 | $ | (9) |  |  | $ | (7) |  |  | $ | 26 |  |  |  |  | $ | 10 |
The following table presents the pretax and after-tax components of other comprehensive income. Components of Other Comprehensive (Loss) Income
dollars in millions | Year ended December 31 |  |
| 2022 |  | 2021 |  |
| Pretax |  | Income Taxes |  | Net of Income Taxes |  | Pretax |  | Income Taxes |  | Net of Income Taxes |  | Income Statement Line Item
Defined benefit pension items |  |  |  |  |  |  |  |  |  |  |  |  |
Actuarial (loss) gain | $ | (33) |  |  | $ | 8 |  |  | $ | (25) |  |  | $ | 98 |  |  | $ | (22) |  |  | $ | 76 |  |  |
Amounts reclassified from AOCI | 12 |  |  | (3) |  |  | 9 |  |  | 27 |  |  | (6) |  |  | 21 |  |  | Other noninterest expense
Other comprehensive (loss) income for defined benefit pension items | $ | (21) |  |  | $ | 5 |  |  | $ | (16) |  |  | $ | 125 |  |  | $ | (28) |  |  | $ | 97 |  |  |
Unrealized loss on securities available for sale transferred to securities held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts reclassified from AOCI | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | (13) |  |  | $ | 3 |  |  | $ | (10) |  |  |
Reclassifications out of AOCI | 1 |  |  | — |  |  | 1 |  |  | (1) |  |  | — |  |  | (1) |  |  | Interest on investment securities
Other comprehensive income (loss) on securities available for sale transferred to securities held to maturity | $ | 1 |  |  | $ | — |  |  | $ | 1 |  |  | $ | (14) |  |  | $ | 3 |  |  | $ | (11) |  |  |
Unrealized loss on securities available for sale |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI activity before reclassification | $ | (960) |  |  | $ | 230 |  |  | $ | (730) |  |  | $ | (81) |  |  | $ | 19 |  |  | $ | (62) |  |  |
Amounts reclassified from AOCI | — |  |  | — |  |  | — |  |  | (33) |  |  | 7 |  |  | (26) |  |  | Realized gain on sale of investment securities available for sale, net
Other comprehensive loss on securities available for sale | $ | (960) |  |  | $ | 230 |  |  | $ | (730) |  |  | $ | (114) |  |  | $ | 26 |  |  | $ | (88) |  |  |
Total other comprehensive loss | $ | (980) |  |  | $ | 235 |  |  | $ | (745) |  |  | $ | (3) |  |  | $ | 1 |  |  | $ | (2) |  |  |

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