Company Restructuring - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges	$ 51	$ 4
Employee costs
Restructuring Cost and Reserve [Line Items]
Cumulative amount incurred to date for active programs	220
Exit costs
Restructuring Cost and Reserve [Line Items]
Cumulative amount incurred to date for active programs	105
Transformative Growth Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges	17		$ 238
Restructuring and related charges approximately	290
Future Work Environment
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges	33
Restructuring and related charges approximately	$ 110