Revenue - Remaining Performance Obligations to be Recognized as Revenue (Details) - USD ($) $ in Billions	Sep. 29, 2019	Dec. 31, 2018
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue, remaining performance obligations		$ 67.9
Revenue, remaining performance obligation, percentage recognized		45.00%
Revenue, remaining performance obligation, expected timing of satisfaction, period		1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-09-30
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue, remaining performance obligations	$ 67.4
Revenue, remaining performance obligation, percentage recognized	55.00%
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year 3 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue, remaining performance obligation, percentage recognized		35.00%
Revenue, remaining performance obligation, expected timing of satisfaction, period		2 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue, remaining performance obligation, percentage recognized	30.00%
Revenue, remaining performance obligation, expected timing of satisfaction, period	2 years