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Fair Value Measurements (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Investment [Line Items] |  |  |
Fair value of total debt |  |  | $ 6,000
Non-operating income | $ 3 | $ 0 |
Fair Value, Inputs, Level 1 |  |  |
Investment [Line Items] |  |  |
Fair value of total debt | 6,000 |  |
Fair Value, Inputs, Level 2 |  |  |
Investment [Line Items] |  |  |
Derivative liability, fair value | 35 |  |
Fair Value, Inputs, Level 3 |  |  |
Investment [Line Items] |  |  |
Contingent consideration liability, fair value | 12 |  |
Fair value of line of credit | $ 28 |  |

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