Restructuring Program - Restructuring Liability Activity (Details) - Simplify to Grow Program - USD ($) $ in Millions	3 Months Ended	83 Months Ended
Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021
Restructuring Reserve [Roll Forward]
Liability balance, January 1, 2021	$ 304
Charges	88	$ 15	$ 2,970
Cash spent	(34)
Non-cash settlements	(40)	(3)
Currency	(10)
Liability balance, March 31, 2021	308		308
Severance and related costs
Restructuring Reserve [Roll Forward]
Liability balance, January 1, 2021	304
Charges	47
Cash spent	(34)	$ (37)
Adjustments	(1)
Currency	(10)
Liability balance, March 31, 2021	308		308
Asset Write-downs
Restructuring Reserve [Roll Forward]
Liability balance, January 1, 2021	0
Charges	41
Cash spent	0
Non-cash settlements	(41)
Currency	0
Liability balance, March 31, 2021	$ 0		$ 0

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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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 expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability.

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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 decrease in the reserve for full or partial settlement through consideration other than cash.

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

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