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Company Restructuring - Changes in the restructuring liability (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
Restructuring Reserve  
Balance as of December 31, 2016 $ 2
Expense incurred 89
Adjustments to liability (3)
Payments applied against liability (43)
Balance as of December 31, 2017 45
Employee costs  
Restructuring Reserve  
Balance as of December 31, 2016 0
Expense incurred 47
Adjustments to liability (3)
Payments applied against liability (29)
Balance as of December 31, 2017 15
Exit costs  
Restructuring Reserve  
Balance as of December 31, 2016 2
Expense incurred 42
Adjustments to liability 0
Payments applied against liability (14)
Balance as of December 31, 2017 $ 30