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Reconciliation of Pension and OPEB Plan Obligations, Assets and Funded Status (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Benefit obligations |  |  |
End of period | $ 6,159 |  |
Fair value of plan assets |  |  |
Beginning of period | 4,501 |  |
End of period | 5,248 | $ 4,501 |
Pension benefits |  |  |
Benefit obligations |  |  |
Beginning of period | 5,717 | 5,423 |
Service cost | 91 | 93 | $ 128
Interest cost | 180 | 183 | 211
Participant contributions | 5 | 5 |
Actuarial loss | 333 | 298 |
Benefit payments | (251) | (234) |
Settlements | (9) | (6) |
Acquisitions | 2 |  |
Plan amendments | (7) |  |
Foreign exchange and other | 98 | (45) |
End of period | 6,159 | 5,717 | 5,423
Fair value of plan assets |  |  |
Beginning of period | 4,501 | 3,698 |
Actual return on plan assets | 708 | 309 |
Employer contributions | 242 | 752 |
Participant contributions | 5 | 5 |
Benefit payments | (251) | (234) |
Settlements | (9) | (6) |
Foreign exchange and other | 52 | (23) |
End of period | 5,248 | 4,501 | 3,698
Funded status at December 31 | (911) | (1,216) |
Amounts recognized in the consolidated balance sheets |  |  |
Noncurrent asset | 65 | 42 |
Current liability | (24) | (23) |
Noncurrent liability | (952) | (1,235) |
Net liability recognized at December 31 | (911) | (1,216) |
OPEB |  |  |
Benefit obligations |  |  |
Beginning of period | 243 | 266 | 243
Service cost | 1 | 2 | 4
Interest cost | 7 | 8 | 14
Actuarial loss | 2 | 10 |
Benefit payments | (18) | (20) |
Plan amendments |  | (23) |
End of period | 235 | 243 | $ 266
Fair value of plan assets |  |  |
Employer contributions | 18 | 20 |
Benefit payments | (18) | (20) |
Funded status at December 31 | (235) | (243) |
Amounts recognized in the consolidated balance sheets |  |  |
Current liability | (19) | (19) |
Noncurrent liability | (216) | (224) |
Net liability recognized at December 31 | $ (235) | $ (243) |

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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + 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 (b)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + 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 (a)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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