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Fair Value Measurements (Major Categories of Financial Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Other current assets |  | $ 103 | [1] | $ 497 | [2]
Investments | [3] | 16 |  |  |
Other assets |  | 45 | [1] | 68 | [2],[4]
Other accrued liabilities |  | 56 | [1] | 44 | [2]
Other liabilities |  | 406 | [1],[5] | 353 | [2],[4]
Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |
Other current assets |  | 103 | [1] | 197 | [2]
Other assets |  | 45 | [1] | 68 | [2],[4]
Other accrued liabilities |  | 56 | [1] | 42 | [2]
Other liabilities |  | 386 | [1],[5] | 333 | [2],[4]
Significant Unobservable Inputs (Level 3) [Member] |  |  |  |  |
Other current assets | [2] |  |  | 300 |
Investments | [3] | 16 |  |  |
Other accrued liabilities | [2] |  |  | 2 |
Other liabilities |  | $ 20 | [1],[5] | $ 20 | [2],[4]
[1] | Derivative assets and liabilities include foreign exchange contracts which are measured using observable inputs for similar assets and liabilities.
[2] | Derivative assets and liabilities include foreign exchange contracts which are measured using observable quoted prices for similar assets and liabilities.
[3] | One of the Company's equity securities was measured using unobservable (Level 3) inputs, in the amount of $16 million.
[4] | 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.
[5] | Other liabilities include contingent consideration that was measured using unobservable (Level 3) inputs, in the amount of $20 million.

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