Income Taxes	6 Months Ended
Jun. 30, 2014
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The effective tax rate for the three months ended June 30, 2014 and 2013 was 33.5% and 22.3%, respectively, and the effective tax rate for the six months ended June 30, 2014 and 2013 was 28.2% and 22.0%, respectively. The effective tax rate for the six months ended June 30, 2014 includes a benefit of $6 million from the resolution of tax examinations and an incremental tax benefit associated with the early extinguishment of debt. The effective tax rate for the three and six months ended June 30, 2013 includes tax benefits of $7 million related to one-time tax planning initiatives and $4 million from the adjustment of non-U.S. tax accounts. The effective tax rate for the six months ended June 30, 2013 also includes a benefit of $4 million from the retroactive effect of 2013 U.S. tax legislation. During 2014, we determined that certain pre-2009 tax deductions associated with software development expenditures had not been deducted on our tax returns, the expenditures could be claimed on our current year return and our deferred tax liability was overstated. We assessed the materiality of this item on previously issued financial statements and concluded that it was not material to any annual or interim period. However, due to the impact of this error on the current year consolidated financial statements, the accompanying unaudited Condensed Consolidated Balance Sheet has been revised for the earliest period presented to increase opening retained earnings by $17 million (see Note 12) and decrease our tax liabilities. As is the case with other large corporations, our tax returns are examined each year by tax authorities in the U.S., other countries and local jurisdictions in which we have operations. Except for issues arising out of certain partnership investments, the IRS examinations of tax years prior to 2009 are closed to audit. Other than the pending application of legal principles to specific issues arising in earlier years, only post-2007 Canadian tax years are subject to examination. Other significant tax filings subject to examination include various post-2004 U.S. state and local, post-2007 German, and post-2011 French and U.K. tax filings. We have other less significant tax filings currently under examination or subject to examination. In August 2012, the United States Court of Appeals for the Third Circuit overturned a prior Tax Court decision and ruled in favor of the IRS and adverse to the Historic Boardwalk Hall LLC, a partnership in which we had made an investment in the year 2000. In January 2014, the Tax Court entered an order to implement rulings of the Third Circuit. Under the terms of the partnership agreement, we are indemnified against any payments we may be required to make. However, the potential for a difference in the timing of payments which may be due to taxing authorities, and the timing of receipts due to us under the partnership agreement, may cause fluctuations in our cash flows in future periods. Further, if we do not recover under the indemnification provisions of the partnership agreement, the amount of tax and interest due as a result of this matter could be as much as $100 million.

Income Taxes

The effective tax rate for the three months ended June 30, 2014 and 2013 was 33.5% and 22.3%, respectively, and the effective tax rate for the six months ended June 30, 2014 and 2013 was 28.2% and 22.0%, respectively. The effective tax rate for the six months ended June 30, 2014 includes a benefit of $6 million from the resolution of tax examinations and an incremental tax benefit associated with the early extinguishment of debt. The effective tax rate for the three and six months ended June 30, 2013 includes tax benefits of $7 million related to one-time tax planning initiatives and $4 million from the adjustment of non-U.S. tax accounts. The effective tax rate for the six months ended June 30, 2013 also includes a benefit of $4 million from the retroactive effect of 2013 U.S. tax legislation.

During 2014, we determined that certain pre-2009 tax deductions associated with software development expenditures had not been deducted on our tax returns, the expenditures could be claimed on our current year return and our deferred tax liability was overstated. We assessed the materiality of this item on previously issued financial statements and concluded that it was not material to any annual or interim period. However, due to the impact of this error on the current year consolidated financial statements, the accompanying unaudited Condensed Consolidated Balance Sheet has been revised for the earliest period presented to increase opening retained earnings by $17 million (see Note 12) and decrease our tax liabilities.

As is the case with other large corporations, our tax returns are examined each year by tax authorities in the U.S., other countries and local jurisdictions in which we have operations. Except for issues arising out of certain partnership investments, the IRS examinations of tax years prior to 2009 are closed to audit. Other than the pending application of legal principles to specific issues arising in earlier years, only post-2007 Canadian tax years are subject to examination. Other significant tax filings subject to examination include various post-2004 U.S. state and local, post-2007 German, and post-2011 French and U.K. tax filings. We have other less significant tax filings currently under examination or subject to examination.

In August 2012, the United States Court of Appeals for the Third Circuit overturned a prior Tax Court decision and ruled in favor of the IRS and adverse to the Historic Boardwalk Hall LLC, a partnership in which we had made an investment in the year 2000. In January 2014, the Tax Court entered an order to implement rulings of the Third Circuit. Under the terms of the partnership agreement, we are indemnified against any payments we may be required to make. However, the potential for a difference in the timing of payments which may be due to taxing authorities, and the timing of receipts due to us under the partnership agreement, may cause fluctuations in our cash flows in future periods. Further, if we do not recover under the indemnification provisions of the partnership agreement, the amount of tax and interest due as a result of this matter could be as much as $100 million.