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Related Party Transactions (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2014 | Jun. 25, 2014 | Dec. 31, 2013 | Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jun. 30, 2012
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total number of shares purchased (in shares) |  |  |  | 1.6 | 2.2 | 2.6 | 4.4 |  |  |  |
Total cash utilized |  |  |  |  |  | $ 273 |  | $ 346 | $ 989 | $ 298 |
Average price paid per share (in dollars per share) |  |  | $ 58.36 | $ 104.82 | $ 79.65 | $ 104.62 | $ 79.06 | $ 79.06 | $ 58.52 | $ 50.35 |
Other (Income) Loss [Member] |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non-cash impairment charge |  |  |  |  | $ 6 |  |  |  |  |  |
Harold W. McGraw III [Member] |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount of transaction with related party | $ 20 |  |  |  |  |  |  |  |  |  |
Total number of shares purchased (in shares) |  | 0.5 |  |  |  |  |  |  |  |  |
Repurchase discount |  | 0.35% |  |  |  |  |  |  |  |  |
Total cash utilized |  | $ 41 |  |  |  |  |  |  |  |  |
Average price paid per share (in dollars per share) |  | $ 82.66 |  |  |  |  |  |  |  |  |
CME Group [Member] | S&P/DJ Indices [Member] |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues earned under license agreement |  |  |  | $ 14 |  | $ 28 |  | $ 52 | $ 46 | $ 21 |
Noncontrolling interest ownership by noncontrolling owners |  |  |  | 27.00% |  | 27.00% |  |  |  |  | 27.00%

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