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Fair Value (Carrying amount and estimated fair value of financial instrument assets and liabilities which are not measured at fair value) (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Dec. 31, 2013
Financial Assets [Abstract]        
Notes receivable for the issuance of common stock $ 0 $ 1 $ 1 $ 23
Mortgage loans 640 588    
Financial Liabilities [Abstract]        
Long term debt 2,211 2,559    
Short term Debt 350 0    
Carrying Amount [Member]        
Financial Assets [Abstract]        
Notes receivable for the issuance of common stock   1    
Mortgage loans 640 588    
Financial Liabilities [Abstract]        
Long term debt 2,211 2,559    
Short term Debt 350      
Estimated Fair Value [Member]        
Financial Assets [Abstract]        
Notes receivable for the issuance of common stock   1    
Mortgage loans 660 608    
Financial Liabilities [Abstract]        
Long term debt 2,478 2,883    
Short term Debt 366      
Level 1 [Member] | Estimated Fair Value [Member]        
Financial Assets [Abstract]        
Notes receivable for the issuance of common stock   0    
Mortgage loans 0 0    
Financial Liabilities [Abstract]        
Long term debt 0 0    
Short term Debt 0      
Level 2 [Member] | Estimated Fair Value [Member]        
Financial Assets [Abstract]        
Notes receivable for the issuance of common stock   0    
Mortgage loans 0 0    
Financial Liabilities [Abstract]        
Long term debt 2,478 2,883    
Short term Debt 366      
Level 3 [Member] | Estimated Fair Value [Member]        
Financial Assets [Abstract]        
Notes receivable for the issuance of common stock   1    
Mortgage loans 660 608    
Financial Liabilities [Abstract]        
Long term debt 0 $ 0    
Short term Debt $ 0