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Revenue from Contracts with Customers - Contract Balances (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 29, 2019
Jun. 30, 2018
Jun. 29, 2019
Jun. 30, 2018
Dec. 31, 2018
Contract with Customer, Asset and Liability [Abstract]          
Accounts receivable, net $ 1,206   $ 1,206   $ 1,293
Contract assets 913   913   1,012
Contract liabilities 1,187   1,187   1,263
Non-current contract liabilities 263   263   $ 214
Contract with customer, liability, revenue recognized $ 340 $ 365 600 $ 541  
Impairment losses   $ 0 $ 0 $ 0