Restructuring and Related Implementation Charges - Restructuring Activity and Related Accruals (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restructuring Reserve [Roll Forward]
Charges	$ 169	$ 105	$ 170
Global Growth and Efficiency Program
Restructuring Reserve [Roll Forward]
Beginning balance	181	215	192
Charges	333	228	254
Cash payments	(244)	(237)	(179)
Charges against assets	(40)	(33)	(42)
Foreign exchange	4	(1)	(10)
Other	0	9	0
Ending balance	234	181	215
Global Growth and Efficiency Program \| Employee-Related Costs
Restructuring Reserve [Roll Forward]
Beginning balance	56	84	85
Charges	163	61	109
Cash payments	(74)	(84)	(85)
Charges against assets	(21)	(4)	(17)
Foreign exchange	3	(1)	(8)
Other	0	0	0
Ending balance	127	56	84
Global Growth and Efficiency Program \| Incremental Depreciation
Restructuring Reserve [Roll Forward]
Beginning balance	0	0	0
Charges	10	9	20
Cash payments	0	0	0
Charges against assets	(10)	(9)	(20)
Foreign exchange	0	0	0
Other	0	0	0
Ending balance	0	0	0
Global Growth and Efficiency Program \| Asset Impairments
Restructuring Reserve [Roll Forward]
Beginning balance	0	0	0
Charges	9	20	5
Cash payments	0	0	0
Charges against assets	(9)	(20)	(5)
Foreign exchange	0	0	0
Other	0	0	0
Ending balance	0	0	0
Global Growth and Efficiency Program \| Other
Restructuring Reserve [Roll Forward]
Beginning balance	125	131	107
Charges	151	138	120
Cash payments	(170)	(153)	(94)
Charges against assets	0	0	0
Foreign exchange	1	0	(2)
Other	0	9	0
Ending balance	$ 107	$ 125	$ 131

Restructuring Reserve, Charges Against Assets

No definition available.

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- Definition

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.

+ 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)(10)
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- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
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-Section 45
-Paragraph 25
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- Definition

Discloses the amount charged against the accrued restructuring reserves, or earnings if not previously accrued, during the period for the specified type of restructuring cost.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
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-Subparagraph (SAB Topic 5.P.4(b))
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- Definition

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 5.P.4(b))
-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747

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-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

Amount of foreign currency translation gain (loss) which decreases (increases) the restructuring reserve.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4(b)(2))
-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747

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-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

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