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Restructuring Actions and Exit Activities - Roll Forward (Details) - Employee-Related - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Sep. 30, 2018
2018 Restructuring Actions          
Restructuring Reserve Roll Forward          
Expenses incurred   $ 105      
Cash payments $ (12)        
Adjustments (7)        
Restructuring actions balances, Ending Balance 86       $ 86
2017 Restructuring Actions          
Restructuring Reserve Roll Forward          
Restructuring actions balances, Beginning Balance         88
Expenses incurred     $ 99    
Cash payments       $ (8) (17)
Adjustments       (3) (27)
Restructuring actions balances, Ending Balance $ 44     $ 88 $ 44