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Accumulated Other Comprehensive Loss and Other Comprehensive Income - Components of accumulated other comprehensive loss (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Components of Accumulated Other Comprehensive Loss    
Beginning of period $ (1,605) $ (1,398)
Other comprehensive income before reclassifications 108 24
Reclassified from Accumulated other comprehensive loss 78 59
Other comprehensive income 186 83
End of period (1,419) (1,315)
Pension and Postretirement Benefits Adjustments    
Components of Accumulated Other Comprehensive Loss    
Beginning of period (1,505) (1,327)
Other comprehensive income before reclassifications   5
Reclassified from Accumulated other comprehensive loss 70 47
Other comprehensive income 70 52
End of period (1,435) (1,275)
Foreign Currency Translation Adjustments    
Components of Accumulated Other Comprehensive Loss    
Beginning of period (96) (47)
Other comprehensive income before reclassifications 98 8
Other comprehensive income 98 8
End of period 2 (39)
Deferred Gains (Losses) on Hedge Contracts    
Components of Accumulated Other Comprehensive Loss    
Beginning of period (4) (24)
Other comprehensive income before reclassifications 10 11
Reclassified from Accumulated other comprehensive loss 8 12
Other comprehensive income 18 23
End of period $ 14 $ (1)