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Fair Value Measurements (Major Categories of Financial Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Other current assets |  | $ 124 | [1] | $ 103 | [2]
Investments | [3] |  |  | 16 |
Other assets |  | 43 | [1] | 45 | [2]
Other accrued liabilities |  | 43 | [1] | 56 | [2]
Other liabilities |  | 257 | [1],[4] | 406 | [2],[5]
Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |
Other current assets |  | 124 | [1] | 103 | [2]
Other assets |  | 43 | [1] | 45 | [2]
Other accrued liabilities |  | 43 | [1] | 56 | [2]
Other liabilities |  | 237 | [1],[4] | 386 | [2],[5]
Significant Unobservable Inputs (Level 3) [Member] |  |  |  |  |
Investments | [3] |  |  | 16 |
Other liabilities |  | 20 | [1],[4] | 20 | [2],[5]
Investments [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |  |
Contingent consideration |  |  |  | 16 |
Other Liabilities [Member] | Significant Unobservable Inputs (Level 3) [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] | Derivative assets and liabilities include foreign exchange contracts which are measured using observable inputs 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] | Other liabilities include contingent consideration that was measured using unobservable (Level 3) inputs, in the amount of $20 million.
[5] | Other liabilities include contingent consideration that was measured using unobservable (Level 3) inputs, in the amount of $20 million.

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