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Other Financial Data - Schedule of Other Current Assets (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017
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Other Financial Data [Abstract] |  |  |
Taxes receivable | $ 172 |  | $ 114
Prepaid expenses | 120 |  | 126
Receivables from divested business | 10 |  | 28
Assets held for sale | 47 |  | 0
Cost to fulfill contracts with customers | 216 |  | 0
Other | 167 |  | 21
Total | $ 732 | $ 587 | $ 289

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