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Restructuring and Related Reorganization Charges - Summary of the Restructuring and Related Reorganization Activity (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Restructuring Reserve [Roll Forward]
Accrued liability as of January 1, 2020			$ 17
Charges	$ 53	$ 4	128	$ 14
Payments			(77)
Accrued liability as of June 30, 2020	68		68
Employee Severance and Benefits
Restructuring Reserve [Roll Forward]
Accrued liability as of January 1, 2020			11
Charges			122
Payments			(65)
Accrued liability as of June 30, 2020	68		68
Other
Restructuring Reserve [Roll Forward]
Accrued liability as of January 1, 2020			6
Charges			6
Payments			(12)
Accrued liability as of June 30, 2020	$ 0		$ 0