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Discontinued Operations - Narrative (Details) |  | 12 Months Ended |
--- | --- | --- | ---
May 01, 2017 USD ($) agreement | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Cash and cash equivalents of discontinued operations |  | $ 0 | $ 5,000,000 | $ 2,000,000
Tempo Business |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Number of commercial agreements | agreement | 2 |  |  |
Tempo Business | Discontinued Operations |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Purchase price | $ 4,300,000,000 |  |  |
Depreciation of fixed assets |  | 8,000,000 | 70,000,000 |
Intangible asset amortization |  | 11,000,000 | $ 120,000,000 |
Cash and cash equivalents of discontinued operations |  | $ 0 |  |
Maximum | Tempo Business | Discontinued Operations |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Purchase price | 4,200,000,000 |  |  |
Deferred consideration | $ 500,000,000 |  |  |

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