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Summary Of Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Retirement Benefits [Abstract] |  |  |
Defined Benefit Plan, Benefit Obligation | $ 779 | $ 720 | $ 656
Employee Benefit Plans [Abstract] |  |  |
Service cost | 5 | 4 | 5
Interest cost | 19 | 21 | 22
Expected return on plan assets | (30) | (27) | (31)
Defined Benefit Plan Amortization Of Unrecognized Amounts | 8 | 5 | 5
Net periodic benefit cost | 2 | 3 | 1
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | (15) | (115) |
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss) | 44 | (53) |
Defined Benefit Plan, Fair Value of Plan Assets | 614 | 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) |

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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 foreign currency translation gain (loss) which (increases) decreases benefit obligation of defined benefit 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)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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