Business Optimization Charges - Summary of Activity in Reserves Related to Restructuring Initiatives (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Restructuring Cost and Reserve [Line Items]
Charges	$ 25	$ 25
Severance and Other Employee Related Costs
Restructuring Cost and Reserve [Line Items]
Reserve, beginning balance	92
Charges	19
Payments	(21)
Currency translation	(2)
Reserve, ending balance	$ 88

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.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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.

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

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