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Basis of Presentation - Recently Adopted Accounting Pronoucements (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Dec. 31, 2017
Restatement Adjustment | Accounting Standards Update 2017-07 | Other income (expense)          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Net periodic benefit excluding service cost $ 18 $ 10 $ 58 $ 10  
Retained Earnings | Accounting Standards Update 2016-16          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Cumulative effect of new accounting pronouncement         $ (31)