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Incentive Compensation Plans Employee Stock Purchase Plans (Details)
 12 Months Ended
Dec. 31, 2014
Employee Stock Purchase Plan description 90% of the lesser of the average market price of a share on the first business day of the offering period or the average market price of a share on the last business day of the offering period of three months
Number of shares initially available for grant 28,800,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Stock Issued During Period, Shares, Employee Stock Purchase Plans 2,800,000us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
Employee stock purchase plan  
Maximum Employee Subscription Rate 10.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
Maximum Number of Shares Per Employee 900us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesPerEmployee
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
Number of shares initially available for grant 15,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember