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Fair Value Measurements (Major Categories of Financial Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Other current assets |  | $ 189 | [1] | $ 497 | [2],[3]
Other assets | [3] |  |  | 68 |
Other accrued liabilities |  | 50 | [1] | 44 | [2],[3]
Other liabilities |  | 307 | [1],[4] | 353 | [2],[3]
Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |
Other current assets |  | 189 | [1] | 197 | [2],[3]
Other assets | [3] |  |  | 68 |
Other accrued liabilities |  | 50 | [1] | 42 | [2],[3]
Other liabilities |  | 287 | [1],[4] | 333 | [2],[3]
Significant Unobservable Inputs (Level 3) [Member] |  |  |  |  |
Other current assets | [2],[3] |  |  | 300 |
Other accrued liabilities | [2],[3] |  |  | 2 |
Other liabilities |  | 20 | [1],[4] | 20 | [2],[3]
Other Current Assets [Member] |  |  |  |  |
Contingent consideration |  |  |  | 300 |
Investments [Member] |  |  |  |  |
Other assets | [5] | 32 |  |  |
Investments [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |  |
Other assets | [5] | 32 |  |  |
Other Noncurrent Assets [Member] |  |  |  |  |
Other assets | [1] | 66 |  |  |
Other Noncurrent Assets [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |
Other assets | [1] | 66 |  |  |
Other Accrued Liabilities [Member] |  |  |  |  |
Contingent consideration |  |  |  | 2 |
Other Liabilities [Member] |  |  |  |  |
Contingent consideration |  | $ 20 |  | $ 20 |
[1] | Derivative assets and liabilities include foreign exchange contracts which are measured using observable inputs for similar assets and liabilities.
[2] | At December 31, 2017, other current assets, other accrued liabilities and other liabilities include contingent consideration that was measured using unobservable (Level 3) inputs, in the amounts of $300 million, $2 million and $20 million, respectively.
[3] | Derivative assets and liabilities include foreign exchange contracts which are measured using observable inputs for similar assets and liabilities.
[4] | Other liabilities include contingent consideration that was measured using unobservable (Level 3) inputs, in the amount of $20 million.
[5] | One of the Company's equity securities was measured using unobservable (Level 3) inputs, in the amount of $32 million.

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