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Other Assets and Other Liabilities (Other Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Other Assets and Other Liabilities [Abstract] |  |
Contingent consideration asset |  | $ 300
Derivative instruments | $ 103 | 197
Other current assets | 599 | 494
Other current assets | 702 | 991
Derivative instruments | 45 | 68
South Korean tax deposits | 425 | 319
Other non-current assets | 551 | 547
Other assets | $ 1,021 | $ 934

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- Definition Noncurrent Tax Deposits + References No definition available. + Details
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