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Significant Accounting Policies Update (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |
Allowance for doubtful accounts | $ 13 |  | $ 13 |  | $ 9
Trade management services |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |
Revenue, remaining performance obligation, expected timing of satisfaction | 12 months |  | 12 months |  |
United States | Listing services |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |
Revenue, remaining performance obligation, expected timing of satisfaction | 12 months |  | 12 months |  |
Europe | Listing services |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |
Revenue, remaining performance obligation, expected timing of satisfaction | 12 months |  | 12 months |  |
Minimum | Listing services |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |
Revenue, remaining performance obligation, expected timing of satisfaction | 2 years |  | 2 years |  |
Maximum | Listing services |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |
Revenue, remaining performance obligation, expected timing of satisfaction | 6 years |  | 6 years |  |
Services transferred at a point in time | Market Services |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |
Revenue recognized (percentage) | 63.00% | 62.00% | 64.00% | 63.00% |
Services transferred over time | Market Services |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |
Revenue recognized (percentage) | 37.00% | 38.00% | 36.00% | 37.00% |

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