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Pension Plans (Tables) | 3 Months Ended
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Mar. 31, 2018
Retirement Benefits [Abstract] |
Net Periodic Benefit Cost Table | Total pension cost and employer contributions were as follows for the periods indicated (in millions):
| Three Months Ended March 31,
| 2018 |  | 2017
| U.S. |  | Foreign |  | U.S. |  | Foreign
Service cost | $ | 4 |  |  | $ | 3 |  |  | $ | 3 |  |  | $ | 3 |
Interest cost | 10 |  |  | 5 |  |  | 10 |  |  | 5 |
Expected return on plan assets | (16 | ) |  | (5 | ) |  | (17 | ) |  | (5 | )
Amortization of prior service cost | 1 |  |  | — |  |  | 1 |  |  | — |
Amortization of net loss | 5 |  |  | 1 |  |  | 5 |  |  | — |
Curtailment loss recognized | 1 |  |  | 2 |  |  | 4 |  |  | — |
Total pension cost | $ | 5 |  |  | $ | 6 |  |  | $ | 6 |  |  | $ | 3 |
| Three Months Ended March 31, 2018 |  | Remainder of 2018 (Expected)
| U.S. |  | Foreign |  | U.S. |  | Foreign
Total employer contributions | $ | 38 |  |  | $ | 3 |  |  | $ | — |  |  | $ | 9 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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