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Pension Plans (Tables) | 6 Months Ended
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Jun. 30, 2016
Compensation and Retirement Disclosure [Abstract] |
Net Periodic Benefit Cost Table | Total pension cost and employer contributions were as follows for the periods indicated (in millions):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2016 |  | 2015 |  | 2016 |  | 2015
| U.S. |  | Foreign |  | U.S. |  | Foreign |  | U.S. |  | Foreign |  | U.S. |  | Foreign
Service cost | $ | 3 |  |  | $ | 3 |  |  | $ | 4 |  |  | $ | 4 |  |  | $ | 6 |  |  | $ | 6 |  |  | $ | 8 |  |  | $ | 8 |
Interest cost | 10 |  |  | 86 |  |  | 11 |  |  | 95 |  |  | 20 |  |  | 163 |  |  | 23 |  |  | 197 |
Expected return on plan assets | (16 | ) |  | (55 | ) |  | (17 | ) |  | (66 | ) |  | (33 | ) |  | (105 | ) |  | (34 | ) |  | (138 | )
Amortization of prior service cost | 2 |  |  | — |  |  | 2 |  |  | — |  |  | 4 |  |  | — |  |  | 4 |  |  | — |
Amortization of net loss | 4 |  |  | 4 |  |  | 5 |  |  | 7 |  |  | 9 |  |  | 9 |  |  | 10 |  |  | 15 |
Total pension cost | $ | 3 |  |  | $ | 38 |  |  | $ | 5 |  |  | $ | 40 |  |  | $ | 6 |  |  | $ | 73 |  |  | $ | 11 |  |  | $ | 82 |
|  |  |  |  |  |  |  |  | Six Months Ended June 30, 2016 |  | Remainder of 2016 (Expected)
|  |  |  |  |  |  |  |  | U.S. |  | Foreign |  | U.S. |  | Foreign
Total employer contributions |  |  |  |  |  |  |  |  | $ | 21 |  |  | $ | 59 |  |  | $ | — |  |  | $ | 38 |

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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=65897934&loc=d3e1928-114920 + Details
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