Company Restructuring - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges	$ 23	$ 196	$ 145	$ 213
Employee costs
Restructuring Cost and Reserve [Line Items]
Cumulative amount incurred to date for active programs	247		247
Exit costs
Restructuring Cost and Reserve [Line Items]
Cumulative amount incurred to date for active programs	$ 133		$ 133