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Revenue from Contracts with Customers - Contract Cost Balances (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 29, 2018
Sep. 29, 2018
Jan. 01, 2018
Dec. 31, 2017
Capitalized Contract Cost [Line Items]        
Current contract cost assets $ 57,000,000 $ 57,000,000 $ 62,000,000 $ 62,000,000
Non-current contract cost assets 95,000,000 95,000,000 $ 85,000,000 $ 0
Contract cost, amortization $ 11,000,000 $ 34,000,000    
Minimum        
Capitalized Contract Cost [Line Items]        
Capitalized contract cost, amortization period   1 year    
Maximum        
Capitalized Contract Cost [Line Items]        
Capitalized contract cost, amortization period   4 years