Restructuring - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]
Provision for inventories	$ 6	$ 6	$ 33
Total expected pre-tax restructuring charges	$ 190
Forecast
Restructuring Cost and Reserve [Line Items]
Total expected pre-tax restructuring charges				$ 50
Severance and employee related costs
Restructuring Cost and Reserve [Line Items]
Percentage of aggregate restructuring charge	60.00%
Facilities and related costs
Restructuring Cost and Reserve [Line Items]
Percentage of aggregate restructuring charge	20.00%
Asset Write-Downs and Other Costs
Restructuring Cost and Reserve [Line Items]
Percentage of aggregate restructuring charge	20.00%
Cost of Sales
Restructuring Cost and Reserve [Line Items]
Provision for inventories	$ 5