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Summary of Funded Status of Pension Plans (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Retirement Benefits [Abstract] |  |  |
Defined Benefit Plan, Plan with Benefit Obligation in Excess of Plan Assets, Benefit Obligation | $ 453 | $ 720 |
Assets for Plan Benefits, Defined Benefit Plan | (24) | 0 |
Liability, Defined Benefit Plan, Current | (3) | (1) |
Liability, Defined Benefit Plan, Noncurrent | (186) | (196) |
Employee Benefit Plans [Abstract] |  |  |
Benefit obligation at end of prior year | 720 | 656 |
Service cost | 5 | 4 | $ 5
Interest cost | 19 | 21 | 22
Actuarial loss | 15 | 115 |
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss) | 44 | (53) |
Benefit obligation at end of current year | 779 | 720 | 656
Fair value of assets at end of prior year | 523 | 527 |
Actual return on plan assets | 59 | 60 |
Employer contributions | 24 | 12 |
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss) | 32 | (53) |
Net benefits paid | (24) | (23) |
Fair value of assets at end of current year | 614 | 523 | 527
Total unfunded status at end of year (recognized in other non-current liabilities in the Consolidated Balance Sheets) | (165) | (197) |
Defined Benefit Plan, Plan with Benefit Obligation in Excess of Plan Assets, Fair Value of Plan Assets | 264 | 523 |
Defined Benefit Plan, Expected Return (Loss) on Plan Assets | 30 | 27 | 31
Defined Benefit Plan Amortization Of Unrecognized Amounts | 8 | 5 | 5
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | 2 | 3 | $ 1
Defined Benefit Plan, Benefit Obligation, Benefits Paid | $ 24 | $ 23 |

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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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- Definition Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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