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Financial Instruments - Summarized Information About Changes in Liabilities for Contingent Consideration (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Contingent consideration | $ 935 | $ 891
Changes in estimated fair value | 89 | 141
Additions | 8 | 3
Payments | (244) | (100)
Contingent consideration | 788 | $ 935
Contingent consideration, liability, current | $ 89 |

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