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Schedule of Changes in Level 3 Plan Assets (Detail) - Significant Unobservable Inputs (Level 3) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at January 1 | $ 602 | $ 924
Net Realized and Unrealized Gains/ (Losses) | 11 | 27
Net Purchases, Issuances and Settlements | 166 | (210)
Net Transfers Into/(Out of) Level 3 | (25) | (6)
Currency Impact | 62 | (133)
Fair value of plan assets at December 31 | 816 | 602
Non-U.S. Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at January 1 | 3 | 0
Net Realized and Unrealized Gains/ (Losses) | 0 | 0
Net Purchases, Issuances and Settlements | 0 | 0
Net Transfers Into/(Out of) Level 3 | (3) | 3
Currency Impact | 0 | 0
Fair value of plan assets at December 31 | 0 | 3
Pooled Funds - Fixed Income Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at January 1 | 35 | 26
Net Realized and Unrealized Gains/ (Losses) | 0 | 6
Net Purchases, Issuances and Settlements | (16) | 15
Net Transfers Into/(Out of) Level 3 | (21) | (7)
Currency Impact | 2 | (5)
Fair value of plan assets at December 31 | 0 | 35
Corporate Bonds And Other Fixed Income Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at January 1 | 538 | 665
Net Realized and Unrealized Gains/ (Losses) | 10 | 21
Net Purchases, Issuances and Settlements | 182 | (41)
Net Transfers Into/(Out of) Level 3 | 0 | 0
Currency Impact | 60 | (107)
Fair value of plan assets at December 31 | 790 | 538
Real Estate |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at January 1 | 22 | 230
Net Realized and Unrealized Gains/ (Losses) | 1 | 0
Net Purchases, Issuances and Settlements | 0 | (184)
Net Transfers Into/(Out of) Level 3 | 0 | (3)
Currency Impact | 0 | (21)
Fair value of plan assets at December 31 | 23 | 22
Private Equity and Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at January 1 | 4 | 3
Net Realized and Unrealized Gains/ (Losses) | 0 | 0
Net Purchases, Issuances and Settlements | 0 | 0
Net Transfers Into/(Out of) Level 3 | (1) | 1
Currency Impact | 0 | 0
Fair value of plan assets at December 31 | $ 3 | $ 4

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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 Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + 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) -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) plan assets 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 (b)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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