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Financial Instruments - Information About Changes in Liabilities for Contingent Consideration (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, beginning balance $ 788 $ 935
Changes in fair value (36) 36
Additions 0 8
Payments (85) (60)
Fair value, ending balance 667 $ 919
Current liability $ 100