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Pension Plans Pension Plan (Notes) | 6 Months Ended
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Jun. 30, 2015
Compensation and Retirement Disclosure [Abstract] |
Pension and Other Postretirement Benefits Disclosure | Pension Plans The components of net periodic benefit cost related to pension benefits for the three and six months ended June 30, 2015 and 2014 were as follows:
| Three Months Ended June 30,
Dollars in millions | 2015 |  | 2014
| United States |  | Int’l |  | United States |  | Int’l
Components of net periodic benefit cost |  |  |  |  |  |  |
Service cost | $ | — |  |  | $ | 1 |  |  | $ | — |  |  | $ | 1 |
Interest cost | — |  |  | 19 |  |  | 1 |  |  | 22 |
Expected return on plan assets | (1 | ) |  | (25 | ) |  | (1 | ) |  | (26 | )
Recognized actuarial loss | 2 |  |  | 11 |  |  | 1 |  |  | 10 |
Net periodic benefit cost | $ | 1 |  |  | $ | 6 |  |  | $ | 1 |  |  | $ | 7 |
| Six Months Ended June 30,
Dollars in millions | 2015 |  | 2014
| United States |  | Int’l |  | United States |  | Int’l
Components of net periodic benefit cost |  |  |  |  |  |  |
Service cost | $ | — |  |  | $ | 1 |  |  | $ | — |  |  | $ | 1 |
Interest cost | 1 |  |  | 38 |  |  | 1 |  |  | 45 |
Expected return on plan assets | (2 | ) |  | (49 | ) |  | (2 | ) |  | (52 | )
Recognized actuarial loss | 3 |  |  | 22 |  |  | 2 |  |  | 19 |
Net periodic benefit cost | $ | 2 |  |  | $ | 12 |  |  | $ | 1 |  |  | $ | 13 |
For the six months ended June 30, 2015, we have contributed approximately $21 million of the $43 million we expect to contribute to our international plans in 2015.

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