Costs Associated with Rationalization Programs - Roll-Forward of the Rationalization Liability Between Periods (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Restructuring Reserve [Roll Forward]
Beginning balance		$ 81
2019 Charges		109
Incurred, including net Foreign Currency Translation of $0 million and $0 million, respectively		(33)
Reversed to the Statement of Operations	$ (7)	(2)	$ (12)
Ending balance		155
Associate Severance and Other Related Costs
Restructuring Reserve [Roll Forward]
Beginning balance		80
2019 Charges		100
Incurred, including net Foreign Currency Translation of $0 million and $0 million, respectively		(23)
Reversed to the Statement of Operations		(2)
Ending balance		155
Foreign currency translation gain (loss)		0
Other Exit Costs
Restructuring Reserve [Roll Forward]
Beginning balance		1
2019 Charges		9
Incurred, including net Foreign Currency Translation of $0 million and $0 million, respectively		(10)
Reversed to the Statement of Operations		0
Ending balance		0
Foreign currency translation gain (loss)		$ 0