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Financial Instruments - Information About Changes in Liabilities for Contingent Consideration (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, beginning balance $ 891 $ 590
Changes in fair value 151 29
Additions 3 300
Payments (100) (25)
Fair value, ending balance 945 $ 894
Current liability $ 234