Restructuring and Related Reorganization Charges - Summary of the Restructuring and Related Reorganization Activity (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Restructuring Reserve [Roll Forward]
Accrued liability as of January 1, 2021	$ 103
Charges	29	$ 75
Payments	(31)
Non-cash items	(14)
Accrued liability as of March 31, 2021	87
Employee Severance and Benefits
Restructuring Reserve [Roll Forward]
Accrued liability as of January 1, 2021	103
Charges	11
Payments	(28)
Non-cash items	(4)
Accrued liability as of March 31, 2021	82
Other
Restructuring Reserve [Roll Forward]
Accrued liability as of January 1, 2021	0
Charges	18
Payments	(3)
Non-cash items	(10)
Accrued liability as of March 31, 2021	$ 5

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

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