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Financial Instruments - Information About Changes in Liabilities for Contingent Consideration (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, beginning balance $ 935 $ 891
Changes in fair value 122 108
Additions 8 3
Payments (235) 0
Fair value, ending balance 830 $ 1,002
Current liability $ 92