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Deferred Revenue (Estimated Deferred Revenue) (Details) (USD $)
In Millions, unless otherwise specified |
Mar. 31, 2014
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Dec. 31, 2013
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Mar. 31, 2013
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Dec. 31, 2012
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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Deferred Revenue Arrangement [Line Items] | ||||||||||||||
| 2014 | $ 248 | [1] | ||||||||||||
| 2015 | 76 | |||||||||||||
| 2016 | 56 | |||||||||||||
| 2017 | 43 | |||||||||||||
| 2018 | 30 | |||||||||||||
| 2019 and thereafter | 45 | |||||||||||||
| Deferred revenue estimated revenue to be recognized | 498 | 294 | 398 | 295 | ||||||||||
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Initial Listing Revenues [Member]
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| Deferred Revenue Arrangement [Line Items] | ||||||||||||||
| 2014 | 9 | [1] | ||||||||||||
| 2015 | 11 | |||||||||||||
| 2016 | 9 | |||||||||||||
| 2017 | 6 | |||||||||||||
| 2018 | 5 | |||||||||||||
| 2019 and thereafter | 3 | |||||||||||||
| Deferred revenue estimated revenue to be recognized | 43 | 41 | 34 | 36 | ||||||||||
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Listing of Additional Shares Revenues [Member]
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| Deferred Revenue Arrangement [Line Items] | ||||||||||||||
| 2014 | 26 | [1] | ||||||||||||
| 2015 | 25 | |||||||||||||
| 2016 | 17 | |||||||||||||
| 2017 | 7 | |||||||||||||
| Deferred revenue estimated revenue to be recognized | 75 | 75 | 76 | 78 | ||||||||||
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Annual Renewal and Other Revenues [Member]
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| Deferred Revenue Arrangement [Line Items] | ||||||||||||||
| 2014 | 148 | [1] | ||||||||||||
| 2015 | 2 | |||||||||||||
| Deferred revenue estimated revenue to be recognized | 150 | 26 | 138 | 32 | ||||||||||
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Technology Solutions [Member]
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| Deferred Revenue Arrangement [Line Items] | ||||||||||||||
| 2014 | 65 | [1],[2] | ||||||||||||
| 2015 | 38 | [2] | ||||||||||||
| 2016 | 30 | [2] | ||||||||||||
| 2017 | 30 | [2] | ||||||||||||
| 2018 | 25 | [2] | ||||||||||||
| 2019 and thereafter | 42 | [2] | ||||||||||||
| Deferred revenue estimated revenue to be recognized | $ 230 | [2],[3] | $ 152 | [3] | $ 150 | [3] | $ 149 | [3] | ||||||
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