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Employee Benefit Plans | 9 Months Ended
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Sep. 30, 2020
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 and nine months ended September 30, 2020 and 2019 were as follows (dollars in millions):
|  | Pension Benefits |  | Other Benefits
|  | Three months ended September 30, |  | Three months ended September 30,
|  | 2020 |  | 2019 |  | 2020 |  | 2019
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 |
|  | Pension Benefits |  | Other Benefits
|  | Nine months ended September 30, |  | Nine months ended September 30,
|  | 2020 |  | 2019 |  | 2020 |  | 2019
Service cost |  | $ | 11 |  |  | $ | 9 |  |  | $ | 2 |  |  | $ | 2 |
Interest cost |  | 4 |  |  | 5 |  |  | 2 |  |  | 2 |
Expected return on plan assets |  | (7 | ) |  | (5 | ) |  | — |  |  | — |
Amortization of prior service cost (credit) |  | — |  |  | — |  |  | (1 | ) |  | (1 | )
Amortization of prior actuarial losses |  | 3 |  |  | 3 |  |  | 1 |  |  | 1 |
Net periodic benefit cost |  | $ | 11 |  |  | $ | 12 |  |  | $ | 4 |  |  | $ | 4 |

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