Income Taxes	9 Months Ended
Sep. 30, 2013
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The effective income tax rate for continuing operations was 32.6% and 32.2%, for the three months ended September 30, 2013 and September 30, 2012, respectively. The effective income tax rate for continuing operations was 33.8% and 35.8% for nine months ended September 30, 2013 and September 30, 2012. The reduction in the effective income tax rate was primarily due to the partnership structure of the S&P Dow Jones Indices LLC and a tax benefit on the sale of Aviation Week as discussed in Note 2 — Acquisitions and Divestitures. At the end of each interim period, we estimate the annual effective tax rate and apply that rate to our ordinary quarterly earnings. The tax expense or benefit related to significant, unusual or extraordinary items that will be separately reported or reported net of their related tax effect, and are individually computed, are recognized in the interim period in which those items occur. In addition, the effect of changes in enacted tax laws or rates or tax status is recognized in the interim period in which the change occurs. As of September 30, 2013 and December 31, 2012, the total amount of federal, state and local, and foreign unrecognized tax benefits was $59 million and $74 million, respectively, exclusive of interest and penalties. The reduction in unrecognized tax benefits is due primarily to tax positions related to prior years that were settled during the quarter ended September 30, 2013. We recognize accrued interest and penalties related to unrecognized tax benefits in interest expense and operating-related expense, respectively. In addition to the unrecognized tax benefits, as of September 30, 2013 and December 31, 2012, we had $16 million and $14 million, respectively, of accrued interest and penalties associated with uncertain tax positions.

Income Taxes

9 Months Ended

Sep. 30, 2013

The effective income tax rate for continuing operations was 32.6% and 32.2%, for the three months ended September 30, 2013 and September 30, 2012, respectively.

The effective income tax rate for continuing operations was 33.8% and 35.8% for nine months ended September 30, 2013 and September 30, 2012. The reduction in the effective income tax rate was primarily due to the partnership structure of the S&P Dow Jones Indices LLC and a tax benefit on the sale of Aviation Week as discussed in Note 2 — Acquisitions and Divestitures.

At the end of each interim period, we estimate the annual effective tax rate and apply that rate to our ordinary quarterly earnings. The tax expense or benefit related to significant, unusual or extraordinary items that will be separately reported or reported net of their related tax effect, and are individually computed, are recognized in the interim period in which those items occur. In addition, the effect of changes in enacted tax laws or rates or tax status is recognized in the interim period in which the change occurs.

As of September 30, 2013 and December 31, 2012, the total amount of federal, state and local, and foreign unrecognized tax benefits was $59 million and $74 million, respectively, exclusive of interest and penalties. The reduction in unrecognized tax benefits is due primarily to tax positions related to prior years that were settled during the quarter ended September 30, 2013.

We recognize accrued interest and penalties related to unrecognized tax benefits in interest expense and operating-related expense, respectively. In addition to the unrecognized tax benefits, as of September 30, 2013 and December 31, 2012, we had $16 million and $14 million, respectively, of accrued interest and penalties associated with uncertain tax positions.