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Equity Method Investments And Variable Interest Entities Equity Method Investments and Variable Interest Entities (Schedule of Equity in Earnings of Unconsolidated Affiliates) (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Dec. 31, 2013
Beginning Balance [Member]      
Equity In Earnings of Unconsolidated Affiliates [Line Items]      
Equity Method Investments   $ 151 $ 156
Joint Venture Earnings [Member]      
Equity In Earnings of Unconsolidated Affiliates [Line Items]      
Equity Method Investments $ 88 163  
Dividends Paid by Joint Venture [Member]      
Equity In Earnings of Unconsolidated Affiliates [Line Items]      
Equity Method Investments (72) (249)  
Advances [Member]      
Equity In Earnings of Unconsolidated Affiliates [Line Items]      
Equity Method Investments (4) (13)  
Cumulative Translation Adjustment [Member]      
Equity In Earnings of Unconsolidated Affiliates [Line Items]      
Equity Method Investments (4) (1)  
Other Activity [Member]      
Equity In Earnings of Unconsolidated Affiliates [Line Items]      
Equity Method Investments 1 0  
Subtotal Before Reclassification [Member]      
Equity In Earnings of Unconsolidated Affiliates [Line Items]      
Equity Method Investments 160 56  
Ending Balance [Member]      
Equity In Earnings of Unconsolidated Affiliates [Line Items]      
Equity Method Investments 165 151  
Reclassification of excess distribution [Member]      
Equity In Earnings of Unconsolidated Affiliates [Line Items]      
Equity Method Investments 9 102  
Recognition of Excess Distribution [Member]      
Equity In Earnings of Unconsolidated Affiliates [Line Items]      
Equity Method Investments $ (4) $ (7)