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Fair Value of Financial Instruments Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings |  |  | $ (23) | $ 14 | $ (3) |
Derivative, Fair Value, Net |  |  | (20) | 12 |  |
Total debt, recorded amount |  |  | 4,344 | 4,149 |  |
Total debt, fair value |  |  | 4,222 | 4,289 |  |
Impairment of Long-Lived Assets Held-for-use |  |  | 4 | 9 | 1 |
Costs associated with acquisitions |  |  | 14 | 8 | 0 |
Net proceeds from divestiture of discontinued operations |  |  | 0 | 0 | 48 |
Gain (loss) on divestiture of discontinued operations, net of tax |  |  |  | 0 | 104 |
Fair Value, Measurements, Recurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Contingent consideration liability |  |  | 49 | 33 |  |
Discontinued Operations, Disposed of by Sale | Thermal Systems |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Gain (loss) on divestiture of discontinued operations, net of tax |  |  |  |  |  | $ 271
Discontinued Operations, Disposed of by Sale | KDAC | Thermal Systems |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Impairment loss on KDAC interest |  | $ 88 |  |  |  |
Fair value of KDAC interest |  | $ 32 |  |  |  |
Net proceeds from divestiture of discontinued operations | $ 70 |  |  |  |  |
Gain (loss) on divestiture of discontinued operations, net of tax | $ 47 |  |  |  |  | $ (41)
Cost of Sales | Fair Value, Measurements, Nonrecurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use |  |  | 4 | 9 | 1 |
Level 2 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Total debt, fair value |  |  | 4,222 | 4,289 |  |
Level 2 | Fair Value, Measurements, Recurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Contingent consideration liability |  |  | 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 |  |  | 16 | 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 |  |  | 33 | 26 |  |
Contingent Consideration liability |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings |  |  | (23) | 14 |  |
Contingent Consideration liability | Fair Value, Measurements, Recurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Contingent consideration liability |  |  | $ 49 | $ 33 | $ 35 |
Contingent Consideration liability | Minimum | 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 |  |  | 2019 |  |  |
Contingent Consideration liability | Maximum | 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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