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Fair Value Measurements (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Investment [Line Items] |  |  |  |  |
Non-operating income | $ 8 | $ 3 | $ 11 | $ 3 |
Fair Value, Inputs, Level 1 |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Fair value of total debt | 14,000 |  | 14,000 |  | $ 6,000
Fair Value, Inputs, Level 3 |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Contingent consideration liability, fair value | 12 |  | 12 |  |
Fair value of line of credit | $ 26 |  | $ 26 |  |

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