Company Restructuring - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges	$ 41	$ 67	$ 96
Employee costs
Restructuring Cost and Reserve [Line Items]
Cumulative amount incurred to date for active programs	112
Exit costs
Restructuring Cost and Reserve [Line Items]
Cumulative amount incurred to date for active programs	$ 12