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Other Financial Data - Schedule of Other Current Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
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Other Financial Data [Abstract] |  |
Deferred revenue | $ 394 | $ 408
Taxes payable | 94 | 64
Deferred tax liability | 1 | 2
Other | 331 | 314
Total Other Current Liabilities | $ 820 | $ 788

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