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Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Investment [Line Items] |  |
Cash payment for contingent consideration | $ 13 |
Contingent consideration liability adjustment | 2 |
Fair Value, Inputs, Level 3 |  |
Investment [Line Items] |  |
Fair value of line of credit | 26 | $ 29
Fair Value | Fair Value, Inputs, Level 2 |  |
Investment [Line Items] |  |
Value of total debt | 22,600 | 6,000
Carrying value |  |
Investment [Line Items] |  |
Value of total debt | 21,500 | 6,000
Fair Value, Recurring | Fair Value, Inputs, Level 3 |  |
Investment [Line Items] |  |
Contingent consideration | $ 1 | $ 12

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