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Pension and Other Postretirement Benefit Plans (Tables) | 3 Months Ended
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Mar. 31, 2018
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 March 31,
| 2018 |  | 2017
($ in millions) | U.S. |  | International |  | U.S. |  | International
Service cost | $ | 83 |  |  | $ | 67 |  |  | $ | 77 |  |  | $ | 61 |
Interest cost | 108 |  |  | 46 |  |  | 113 |  |  | 41 |
Expected return on plan assets | (214 | ) |  | (113 | ) |  | (218 | ) |  | (94 | )
Amortization of unrecognized prior service credit | (13 | ) |  | (3 | ) |  | (13 | ) |  | (2 | )
Net loss amortization | 56 |  |  | 21 |  |  | 44 |  |  | 23 |
Termination benefits | 11 |  |  | — |  |  | 5 |  |  | 1 |
Curtailments | (2 | ) |  | — |  |  | 3 |  |  | — |
Settlements | 1 |  |  | — |  |  | — |  |  | — |
| $ | 30 |  |  | $ | 18 |  |  | $ | 11 |  |  | $ | 30 |
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 March 31,
($ in millions) | 2018 |  | 2017
Service cost | $ | 14 |  |  | $ | 14 |
Interest cost | 18 |  |  | 20 |
Expected return on plan assets | (21 | ) |  | (19 | )
Amortization of unrecognized prior service credit | (21 | ) |  | (25 | )
Termination benefits | 1 |  |  | 1 |
Curtailments | (4 | ) |  | (3 | )
| $ | (13 | ) |  | $ | (12 | )

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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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