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Fair Value of Financial Assets and Liabilities - Nonrecurring (Details) - Fair Value, Measurements, Nonrecurring [Member] - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Carrying Amount [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents $ 148 $ 140
Accounts receivable, net 1,420 1,246
Short-term debt 22 24
Long-term debt 26 37
Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 148 140
Accounts receivable, net 1,420 1,246
Short-term debt 22 24
Long-term debt $ 26 $ 37