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Revenues - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Contract payment period |  |  | 15 days
Contract liabilities | $ 0 |  | $ 0
Impairment loss | $ 0 | $ 0 |
Minimum |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Transit time |  |  | 3 days
Maximum |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Transit time |  |  | 8 days
Customer Concentration Risk | Sales Revenue |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Revenue from other services (as a percent) | 4.00% |  | 5.00%

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