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Fair Value Of Financial Instruments Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative, Fair Value, Net | $ 9 |  | $ 9 |  | $ 12
Total debt, recorded amount | 4,108 |  | 4,108 |  | 4,149
Asset Impairment Charges | 1 | $ 1 | 2 | $ 2 |
Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Contingent consideration liability | 26 |  | 26 |  | 33
Cost of Sales [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Asset Impairment Charges | 1 | $ 1 | 2 | 2 |
Fair Value, Inputs, Level 2 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total debt, fair value | 4,042 |  | 4,042 |  | 4,289
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Contingent consideration liability | 0 |  | 0 |  | 0
Other Current Liabilities | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Contingent consideration liability | 7 |  | 7 |  | 7
Other Long-Term Liabilities | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Contingent consideration liability | 19 |  | 19 |  | 26
Contingent Consideration Liability |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Payments |  |  | 7 | $ 22 |
Contingent Consideration Liability | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Contingent consideration liability | $ 26 |  | $ 26 |  | $ 33
Minimum [Member] | Contingent Consideration Liability | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Periods in which milestones are expected to be achieved |  |  | 2018 |  |
Maximum [Member] | Contingent Consideration Liability | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Periods in which milestones are expected to be achieved |  |  | 2020 |  |

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