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Employee Benefit Plans | 3 Months Ended
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Mar. 31, 2021
Retirement Benefits [Abstract] |
Employee Benefit Plans | Employee Benefit Plans The components of net periodic benefit cost, included in other operating expenses on the Company’s condensed consolidated statements of income, for the three months ended March 31, 2021 and 2020 were as follows (dollars in millions):
|  | Pension Benefits |  | Other Benefits
|  | Three months ended March 31, |  | Three months ended March 31,
|  | 2021 |  | 2020 |  | 2021 |  | 2020
Service cost |  | $ | 4 |  |  | $ | 3 |  |  | $ | 1 |  |  | $ | — |
Interest cost |  | 1 |  |  | 2 |  |  | — |  |  | 1 |
Expected return on plan assets |  | (2) |  |  | (2) |  |  | — |  |  | — |
Amortization of prior service cost (credit) |  | — |  |  | — |  |  | — |  |  | — |
Amortization of prior actuarial losses |  | 1 |  |  | 1 |  |  | — |  |  | — |
Net periodic benefit cost |  | $ | 4 |  |  | $ | 4 |  |  | $ | 1 |  |  | $ | 1 |

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