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Significant Accounting Policies - Reclassifications (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle      
Cost of goods sold $ 5,594 $ 5,536 $ 5,392
Selling and administrative expense 483 484 503
Other expense, net $ (269) (323) (174)
Proforma Adjustment [Member] | Reclassification Adjustment      
New Accounting Pronouncements or Change in Accounting Principle      
Cost of goods sold   (200) (98)
Selling and administrative expense   (18)  
Other expense, net   $ 218 $ 98