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Revenue Recognition - Impact of Adoption on Balance Sheet and Statement of Operations (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018 | Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Other long-term liabilities | $ 160 | $ 160 | $ 354
Accumulated deficit | (16,173) | (16,173) | $ (16,525)
Revenue from contracts with customers | 1,331 | 3,924 |
Marketing [Member] |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Revenue from contracts with customers | 1,219 | 3,738 |
Marketing | 1,238 | 3,798 |
Calculated under revenue guidance in effect before Topic 606 [Member] | Marketing [Member] |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Revenue from contracts with customers | 1,508 | 4,320 |
Marketing | 1,516 | 4,365 |
Difference between revenue guidance in effect before and after Topic 606 [Member] | Marketing [Member] | ASU 2014-09 [Member] |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Revenue from contracts with customers | (289) | (582) |
Marketing | $ (278) | $ (567) |

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