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Restructuring (Details) - 2015 Restructuring Plan $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) position
Restructuring Cost and Reserve [Line Items] |  |
Workforce reduction (in positions) | position |  | 550
Initial Charge Recorded | $ 63 |
Ending Reserve Balance | 42 | $ 50
Restructuring charges paid | 8 |
S&P Ratings |  |
Restructuring Cost and Reserve [Line Items] |  |
Initial Charge Recorded | 18 |
Ending Reserve Balance | 13 |
S&P Global Market Intelligence |  |
Restructuring Cost and Reserve [Line Items] |  |
Initial Charge Recorded | 31 |
Ending Reserve Balance | 19 |
C&C |  |
Restructuring Cost and Reserve [Line Items] |  |
Initial Charge Recorded | 3 |
Ending Reserve Balance | 1 |
Corporate |  |
Restructuring Cost and Reserve [Line Items] |  |
Initial Charge Recorded | 11 |
Ending Reserve Balance | $ 9 |

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