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Other Financial Data - Schedule of Other Current Liabilities (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017
Other Financial Data [Abstract] |  |  |  |
Deferred revenue | $ 332 | $ 332 |  | $ 311
Taxes payable | 25 | 25 |  | 139
Liabilities held for sale | 41 | 41 |  | 0
Other | 723 | 723 |  | 420
Total | 1,121 | 1,121 | $ 883 | 870
Revenue recognized from deferred revenue | 115 | 215 |  |
Current portion of transition tax | $ 42 | $ 42 |  | $ 42

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