Restructuring and Related Implementation Charges - Restructuring Activity and Related Accruals (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Reserve [Roll Forward]
Restructuring and related charges (benefits)	$ (13)	$ 57	$ 88
Global Growth and Efficiency Program
Restructuring Reserve [Roll Forward]
Beginning balance	100	202	234
Restructuring and related charges (benefits)		132	161
Cash payments	(53)	(113)	(167)
Charges against assets		(76)	(27)
Foreign exchange		3	(4)
Other		(48)	5
Ending balance	31	100	202
Global Growth and Efficiency Program \| Employee-Related Costs
Restructuring Reserve [Roll Forward]
Beginning balance	26	60	127
Restructuring and related charges (benefits)		25	53
Cash payments		(55)	(107)
Charges against assets	(3)	(7)	(9)
Foreign exchange		3	(4)
Other		0	0
Ending balance		26	60
Global Growth and Efficiency Program \| Incremental Depreciation
Restructuring Reserve [Roll Forward]
Beginning balance	0	0	0
Restructuring and related charges (benefits)		36	2
Cash payments		0	0
Charges against assets		(36)	(2)
Foreign exchange		0	0
Other		0	0
Ending balance		0	0
Global Growth and Efficiency Program \| Asset Impairments
Restructuring Reserve [Roll Forward]
Beginning balance	0	0	0
Restructuring and related charges (benefits)		6	16
Cash payments		0	0
Charges against assets		(6)	(16)
Foreign exchange		0	0
Other		0	0
Ending balance		0	0
Global Growth and Efficiency Program \| Other
Restructuring Reserve [Roll Forward]
Beginning balance	$ 74	142	107
Restructuring and related charges (benefits)		65	90
Cash payments		(58)	(60)
Charges against assets		(27)	0
Foreign exchange		0	0
Other		(48)	5
Ending balance		$ 74	$ 142

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

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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
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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

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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.

+ References

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- Definition

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

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

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