Restructuring and Related Implementation Charges - Restructuring Activity and Related Accruals (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restructuring Reserve [Roll Forward]
Charges	$ 88	$ 152	$ 93
Global Growth and Efficiency Program
Restructuring Reserve [Roll Forward]
Beginning balance	234	181	215
Charges	161	333	228
Cash payments	(167)	(244)	(237)
Charges against assets	(27)	(40)	(33)
Foreign exchange	(4)	4	(1)
Other	5	0	9
Ending balance	202	234	181
Global Growth and Efficiency Program \| Employee-Related Costs
Restructuring Reserve [Roll Forward]
Beginning balance	127	56	84
Charges	53	163	61
Cash payments	(107)	(74)	(84)
Charges against assets	(9)	(21)	(4)
Foreign exchange	(4)	3	(1)
Other	0	0	0
Ending balance	60	127	56
Global Growth and Efficiency Program \| Incremental Depreciation
Restructuring Reserve [Roll Forward]
Beginning balance	0	0	0
Charges	2	10	9
Cash payments	0	0	0
Charges against assets	(2)	(10)	(9)
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	16	9	20
Cash payments	0	0	0
Charges against assets	(16)	(9)	(20)
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	107	125	131
Charges	90	151	138
Cash payments	(60)	(170)	(153)
Charges against assets	0	0	0
Foreign exchange	0	1	0
Other	5	0	9
Ending balance	$ 142	$ 107	$ 125

Restructuring Reserve, Charges Against Assets

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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

+ Details

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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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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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://fasb.org/us-gaap/role/ref/legacyRef
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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.

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- Definition

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

+ References

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Amount of increase (decrease) in the restructuring reserve related to foreign currency translation (gain) loss and other increases (decreases).

+ References

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