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Other Financial Data - Accounts Receivable, Net (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Accounts receivable $ 1,420 $ 1,454
Less allowance for doubtful accounts (38) (44)
Accounts receivable, net $ 1,382 $ 1,410