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Other (Income) Expense - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Other (Income) Expense [Line Items]    
Other (income) expense $ 37 $ 8
Net periodic defined benefits expense (reversal of expense), excluding service cost component 2 $ 10
Professional fees 4  
Insurance deductible 3  
Accounting Standards Update, Pension and Postretirement Benefits Cost | Restatement Adjustment    
Other (Income) Expense [Line Items]    
Other (income) expense $ 9