Quarterly report pursuant to Section 13 or 15(d)

Assets And Liabilities Measured At Fair Value - Realized and Unrealized Gains (Losses) on Financial Instruments (Details)

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Assets And Liabilities Measured At Fair Value - Realized and Unrealized Gains (Losses) on Financial Instruments (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Realized and unrealized gains (losses) on financial instruments, net $ 18 $ 7 $ (43) $ (33)
Fair Value Option Securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Realized and unrealized gains (losses) on financial instruments, net 56 14 76 43
Debt measured at fair value        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Realized and unrealized gains (losses) on financial instruments, net (42) (76) (236) (75)
Bond Hedge Change in Fair Value        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Realized and unrealized gains (losses) on financial instruments, net 6 $ 69 130 1
Other derivatives        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Realized and unrealized gains (losses) on financial instruments, net $ (2)   $ (13) $ (2)