Quarterly report pursuant to Section 13 or 15(d)

Assets And Liabilities Measured At Fair Value Realized Unrealized Gain Loss (Details)

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Assets And Liabilities Measured At Fair Value Realized Unrealized Gain Loss (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Realized and unrealized gains (losses) on financial instruments, net $ 18 $ 15 $ (48) $ (49)
Fair Value Option Securities
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Realized and unrealized gains (losses) on financial instruments, net 1 31 81 367
Exchangeable Senior Debentures
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Realized and unrealized gains (losses) on financial instruments, net 17 (15) (129) (431)
Other Financial Instruments
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Realized and unrealized gains (losses) on financial instruments, net   $ (1)   $ 15