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Pension and Other Postretirement Benefit Plans (Tables) | 6 Months Ended
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Jun. 30, 2017
Pension Plans |
Defined Benefit Plan Disclosure [Line Items] |
Components of net cost of defined benefit plans | The Company has defined benefit pension plans covering eligible employees in the United States and in certain of its international subsidiaries. The net periodic benefit cost (credit) of such plans consisted of the following components:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
($ in millions) | U.S. |  | International |  | U.S. |  | International |  | U.S. |  | International |  | U.S. |  | International
Service cost | $ | 77 |  |  | $ | 63 |  |  | $ | 73 |  |  | $ | 62 |  |  | $ | 154 |  |  | $ | 124 |  |  | $ | 146 |  |  | $ | 120 |
Interest cost | 113 |  |  | 42 |  |  | 113 |  |  | 52 |  |  | 226 |  |  | 83 |  |  | 226 |  |  | 105 |
Expected return on plan assets | (218 | ) |  | (97 | ) |  | (210 | ) |  | (97 | ) |  | (436 | ) |  | (191 | ) |  | (420 | ) |  | (193 | )
Amortization of unrecognized prior service credit | (13 | ) |  | (3 | ) |  | (14 | ) |  | (3 | ) |  | (27 | ) |  | (5 | ) |  | (27 | ) |  | (6 | )
Net loss amortization | 44 |  |  | 24 |  |  | 29 |  |  | 21 |  |  | 89 |  |  | 47 |  |  | 57 |  |  | 43 |
Termination benefits | 3 |  |  | 1 |  |  | 1 |  |  | — |  |  | 8 |  |  | 2 |  |  | 5 |  |  | — |
Curtailments | 1 |  |  | (1 | ) |  | — |  |  | — |  |  | 4 |  |  | (1 | ) |  | — |  |  | 1 |
| $ | 7 |  |  | $ | 29 |  |  | $ | (8 | ) |  | $ | 35 |  |  | $ | 18 |  |  | $ | 59 |  |  | $ | (13 | ) |  | $ | 70 |
Other Postretirement Benefit Plans |
Defined Benefit Plan Disclosure [Line Items] |
Components of net cost of defined benefit plans | The Company provides medical benefits, principally to its eligible U.S. retirees and similar benefits to their dependents, through its other postretirement benefit plans. The net cost (credit) of such plans consisted of the following components:
| Three Months Ended June 30, |  | Six Months Ended June 30,
($ in millions) | 2017 |  | 2016 |  | 2017 |  | 2016
Service cost | $ | 14 |  |  | $ | 13 |  |  | $ | 28 |  |  | $ | 27 |
Interest cost | 20 |  |  | 21 |  |  | 40 |  |  | 42 |
Expected return on plan assets | (20 | ) |  | (34 | ) |  | (39 | ) |  | (69 | )
Amortization of unrecognized prior service credit | (24 | ) |  | (26 | ) |  | (49 | ) |  | (53 | )
Termination benefits | — |  |  | — |  |  | 1 |  |  | 1 |
Curtailments | (2 | ) |  | (1 | ) |  | (5 | ) |  | (2 | )
| $ | (12 | ) |  | $ | (27 | ) |  | $ | (24 | ) |  | $ | (54 | )

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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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