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Restructuring and Related Reorganization Charges - Summary of the Restructuring and Related Reorganization Activity (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Restructuring Reserve [Roll Forward]
Accrued liability as of January 1, 2020			$ 17
Charges	$ 78	$ 2	206	$ 16
Payments			(103)
Non-cash items			0
Accrued liability as of September 30, 2020	120		120
Employee Severance and Benefits
Restructuring Reserve [Roll Forward]
Accrued liability as of January 1, 2020			11
Charges			195
Payments			(89)
Non-cash items			3
Accrued liability as of September 30, 2020	120		120
Other
Restructuring Reserve [Roll Forward]
Accrued liability as of January 1, 2020			6
Charges			11
Payments			(14)
Non-cash items			(3)
Accrued liability as of September 30, 2020	$ 0		$ 0