2018 Global Restructuring Program Restructuring Reserve [Roll Forward] (Details) - 2018 Global Restructuring Program - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Restructuring Cost and Reserve
Restructuring liabilities - January 1	$ 132	$ 210
Cash payments	(249)	(302)
Currency and other	0	3
Restructuring liabilities - December 31	93	132
Workforce reductions and other cash exit costs
Restructuring Cost and Reserve
Charges for workforce reductions and other cash exit costs	$ 210	$ 221

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

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