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Revenue from Contracts with Customers - Contract Cost Balances (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 28, 2019
Sep. 29, 2018
Sep. 28, 2019
Sep. 29, 2018
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]          
Current contract cost assets $ 28   $ 28   $ 30
Non-current contract cost assets 102   102   $ 98
Contract cost, amortization $ 10 $ 11 $ 32 $ 34