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Retirement Benefits | 6 Months Ended
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Jun. 30, 2021
Retirement Benefits [Abstract] |
Retirement Benefits | Retirement Benefits The components of net periodic benefit cost related to pension benefits for the three and six months ended June 30, 2021 and 2020 were as follows:
| Three Months Ended June 30,
| 2021 |  | 2020
Dollars in millions | United States |  | Int’l |  | United States |  | Int’l
Components of net periodic pension cost (benefit) |  |  |  |  |  |  |
Interest cost | $ | 1 |  |  | $ | 8 |  |  | $ | — |  |  | $ | 9 |
Expected return on plan assets | (1) |  |  | (22) |  |  | (1) |  |  | (14) |
Amortization of prior service cost | — |  |  | 1 |  |  | — |  |  | 1 |
Recognized actuarial loss | — |  |  | 8 |  |  | 1 |  |  | 5 |
Net periodic benefit cost (benefit) | $ | — |  |  | $ | (5) |  |  | $ | — |  |  | $ | 1 |
| Six Months Ended June 30,
| 2021 |  | 2020
Dollars in millions | United States |  | Int’l |  | United States |  | Int’l
Components of net periodic pension cost (benefit) |  |  |  |  |  |  |
Interest cost | $ | 1 |  |  | $ | 16 |  |  | $ | 1 |  |  | $ | 19 |
Expected return on plan assets | (2) |  |  | (43) |  |  | (2) |  |  | (29) |
Amortization of prior service cost | — |  |  | 1 |  |  | — |  |  | 1 |
Recognized actuarial loss | 1 |  |  | 16 |  |  | 1 |  |  | 11 |
Net periodic pension cost (benefit) | $ | — |  |  | $ | (10) |  |  | $ | — |  |  | $ | 2 |
For the six months ended June 30, 2021, we have contributed approximately $24 million of the $50 million we expect to contribute to our plans in 2021.

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