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Projected Benefit Obligations, Plan Assets and Funded Status of Pension Plans (Detail) - Pension Plans - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at January 1 | $ 6,817 |  |
Fair value of plan assets at December 31 | 8,534 | $ 6,817 |
U.S. Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accrued benefit obligation at January 1 | 1,614 | 1,566 |
Service cost | 46 | 57 | $ 64
Interest cost | 62 | 61 | 67
Benefits paid | (32) | (32) |
Settlements paid | (111) | (91) |
Actuarial losses | 179 | 52 |
Divestiture | 0 | 0 |
Currency | 0 | 0 |
Other | 4 | 1 |
Accrued benefit obligation at December 31 | 1,762 | 1,614 | 1,566
Fair value of plan assets at January 1 | 1,620 | 1,247 |
Actual return on plan assets | 217 | 118 |
Contributions | 23 | 378 |
Benefits paid | (32) | (32) |
Settlements paid | (111) | (91) |
Divestiture | 0 | 0 |
Currency | 0 | 0 |
Other | 0 | 0 |
Fair value of plan assets at December 31 | 1,717 | 1,620 | 1,247
Net pension (liabilities)/assets at December 31 | (45) | 6 |
Non-U.S. Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accrued benefit obligation at January 1 | 9,814 | 9,547 |
Service cost | 156 | 147 | 188
Interest cost | 199 | 229 | 307
Benefits paid | (471) | (425) |
Settlements paid | 0 | 0 |
Actuarial losses | 180 | 1,284 |
Divestiture | (14) | (5) |
Currency | 976 | (979) |
Other | 12 | 16 |
Accrued benefit obligation at December 31 | 10,852 | 9,814 | 9,547
Fair value of plan assets at January 1 | 7,926 | 7,721 |
Actual return on plan assets | 592 | 1,079 |
Contributions | 482 | 419 |
Benefits paid | (471) | (425) |
Settlements paid | 0 | 0 |
Divestiture | 0 | (4) |
Currency | 798 | (863) |
Other | 0 | (1) |
Fair value of plan assets at December 31 | 9,327 | 7,926 | $ 7,721
Net pension (liabilities)/assets at December 31 | $ (1,525) | $ (1,888) |

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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 funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status. + 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 (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919 + Details
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