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Separation Activities and Initial Public Offering (Initial Public Offering) (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Feb. 06, 2013
Class of Stock [Line Items]      
Common stock, shares issued 501,342,267us-gaap_CommonStockSharesIssued 500,007,735us-gaap_CommonStockSharesIssued  
Common stock, shares outstanding 501,327,524us-gaap_CommonStockSharesOutstanding 500,007,428us-gaap_CommonStockSharesOutstanding  
Common Class A      
Class of Stock [Line Items]      
Common stock, shares outstanding     99,015,000us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Common Class A | IPO [Member]      
Class of Stock [Line Items]      
Common stock, shares issued     99,015,000us-gaap_CommonStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
Share price     26.00us-gaap_SharePrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
Common Class B      
Class of Stock [Line Items]      
Common stock, shares outstanding     400,985,000us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember