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Employee Benefit Plans (Tables) | 3 Months Ended
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Mar. 31, 2022
Retirement Benefits [Abstract] |
Schedule of Net Benefit Costs | For the three months ended March 31, 2022 and 2021, the components of net periodic benefit cost are as follows:
| Three months ended March 31,
dollars in millions | 2022 |  | 2021
Service cost | $ | 3 |  |  | $ | 4 |
Interest cost | 11 |  |  | 7 |
Expected return on assets | (22) |  |  | (20) |
Amortization of prior service cost | — |  |  | — |
Amortization of net actuarial loss | 3 |  |  | 7 |
Net periodic benefit | $ | (5) |  |  | $ | (2) |
Schedule of Nonvested Restricted Stock Units Activity | The following table presents the unvested BancShares RSUs at March 31, 2022, which have vesting periods through 2024. There were no grants of stock-based compensation awards during the quarter ended March 31, 2022. Stock-Settled Awards Outstanding
| Stock-Settled Awards
per share amounts in whole dollars | Number of Shares |  | Weighted Average Grant Date Value
Unvested BancShares at December 31, 2021 | — |  |  | $ | — |
Unvested CIT RSUs converted to BancShares RSUs at Merger Date | 116,958 |  |  | 859.76 |
Unvested CIT PSUs converted to RSUs at Merger Date | 10,678 |  |  | 859.76 |
Forfeited / cancelled | (411) |  |  | 859.76 |
Vested / settled awards | (71,171) |  |  | 859.76 |
Vested / unsettled awards | (95) |  |  | 859.76 |
Unvested BancShares RSUs at March 31, 2022 | 55,959 |  |  | $ | 859.76 |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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