Income Taxes (Tables)	3 Months Ended
	Mar. 31, 2012
Income Taxes (Tables) [Abstract]
Effective income tax rate	The following table summarizes the Company’s effective tax rate: ##RS Each of the periods reflects recurring, permanent tax benefits in relation to the level of pretax income. Each of the periods reflects recurring, permanent tax benefits in relation to the level of pretax income. The income tax provision for the three months ended March 31, 2012 includes a $50 million tax benefit related to the realization of certain foreign tax credits. The income tax provision for the year ended December 31, 2011 included benefits related to the realization of certain foreign tax credits as well as the favorable resolution of certain prior years’ tax items.