Pension and Postretirement Benefit Plans - Reconciliations of Changes in Benefit Obligations, Plan Assets and Funded Status (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reconciliation of fair value of plan assets [Roll Forward]:
Fair value at beginning of period	$ 1,505
Fair value at end of period	1,584	$ 1,505
Pension Plan [Member] \| UNITED STATES
Reconciliation of benefit obligation [Roll Forward]:
Obligation at beginning of period	1,682	1,692
Interest cost	51	53	$ 66
Service cost
Actuarial (gain) loss	115	59
Benefit payments	(118)	(122)
New plans
Settlements
Other
Translation adjustments
Obligation at end of period	1,730	1,682	1,692
Reconciliation of fair value of plan assets [Roll Forward]:
Fair value at beginning of period	1,454	1,493
Actual return on plan assets	175	83
Employer contributions	2
Benefit payments	(118)	(122)
Settlements
Translation adjustments
Fair value at end of period	1,513	1,454	1,493
Funded status at end of period	(217)	(228)
Pension Plan [Member] \| Foreign Plan [Member]
Reconciliation of benefit obligation [Roll Forward]:
Obligation at beginning of period	309	288
Interest cost	7	7	8
Service cost	7	5	5
Actuarial (gain) loss	7	18
Benefit payments	(14)	(12)
Acquisitions	22
New plans		14
Settlements	(1)	(2)
Termination benefit	1
Curtailment	(1)
Other		(5)
Translation adjustments	40	(4)
Obligation at end of period	377	309	288
Reconciliation of fair value of plan assets [Roll Forward]:
Fair value at beginning of period	51	40
Actual return on plan assets	6	4
Employer contributions	15	15
Benefit payments	(14)	(12)
Settlements	(1)	(2)
New plans		4
Acquisition	12
Translation adjustments	2	2
Fair value at end of period	71	51	40
Funded status at end of period	(306)	(258)
Other Postretirement Benefits Plan [Member] \| Foreign Plan [Member]
Reconciliation of benefit obligation [Roll Forward]:
Obligation at beginning of period	91	86
Interest cost	3	3	3
Service cost	1	1	1
Actuarial (gain) loss	2	4
Benefit payments	(5)	(5)
New plans
Settlements
Other
Translation adjustments	7	2
Obligation at end of period	99	91	86
Reconciliation of fair value of plan assets [Roll Forward]:
Fair value at beginning of period	0	0
Actual return on plan assets
Employer contributions	5	5
Benefit payments	(5)	(5)
Settlements
Translation adjustments
Fair value at end of period	0	0	$ 0
Funded status at end of period	$ (99)	$ (91)

Amount of increase in plan assets attributed to a new plan.

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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.

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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.

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Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Amount of payment to participant of defined benefit plan which decreases benefit obligation. 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

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Amount of increase in benefit obligation of defined benefit plan from business combination.

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Amount of increase in plan assets of defined benefit plan from business combination.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
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Amount of (increase) decrease in benefit obligation of defined benefit plan from event reducing expected years of future service of present employees or eliminating accrual of benefits for some or all future services of present employees.

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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.

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Amount of foreign currency translation gain (loss) which (increases) decreases benefit obligation of defined benefit plan.

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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.

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Amount of cost recognized for passage of time related to defined benefit plan.

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Amount of increase (decrease) in benefit obligation of defined benefit plan from change, classified as other.

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Amount of increase (decrease) in benefit obligation of defined benefit plan from change in terms of existing plan or initiation of new plan.

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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
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Amount of foreign currency translation gain (loss) which increases (decreases) plan assets of defined benefit plan.

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Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Amount of (increase) decrease to benefit obligation of defined benefit plan from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Includes, but is not limited to, lump-sum cash payment to participant in exchange for right to receive specified benefits, purchase of nonparticipating annuity contract and change from remeasurement.

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Amount of payment, which decreases plan assets of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of increase in benefit obligation for benefits provided to employees payable from defined benefit plan or payable upon retirement.

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