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Other Financial Data - Schedule of Other Non-current Assets (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017
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Other Financial Data [Abstract] |  |  |
Investments | $ 54 |  | $ 57
Taxes receivable | 77 |  | 84
Cost to obtain contracts with customers | 144 |  | 0
Other | 129 |  | 166
Total | $ 404 | $ 452 | $ 307

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