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Restructuring and Other Charges - Balance Sheet Location of Accrued Liabilities for Restructuring and Other Cost Reduction Programs (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]    
Total $ 24 $ 38
Accounts payable    
Restructuring Cost and Reserve [Line Items]    
Restructuring reserve, current 14 26
Payroll and benefits payable    
Restructuring Cost and Reserve [Line Items]    
Restructuring reserve, current 2 4
Deferred credits and other noncurrent liabilities    
Restructuring Cost and Reserve [Line Items]    
Restructuring reserve, noncurrent $ 8 $ 8