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Long-term Debt (Scheduled Remaining Maturity of Long-term Debt) (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
2016 $ 2,116  
2017 16,129  
2018 11,111  
2019 8,820  
2020 6,328  
2021 and thereafter 11,851  
Derivative, Amount of Hedged Item 481 $ 331
Long-term debt 56,836 66,234
Unsecured Debt [Member]    
Debt Instrument [Line Items]    
2016 (2)  
2017 4,274  
2018 3,599  
2019 1,623  
2020 2,173  
2021 and thereafter 8,022  
Derivative, Amount of Hedged Item 471 334
Debt Instrument, Unamortized Discount (1,347)  
Long-term debt 20,160 20,966
Debt Instrument, Unamortized Discount (21)  
Unsecured Debt [Member] | Debt Instrument, Redemption, Period One [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Unamortized Discount, Noncurrent (91)  
Unsecured Debt [Member] | Debt Instrument, Redemption, Period Two [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Unamortized Discount, Noncurrent (101)  
Unsecured Debt [Member] | Debt Instrument, Redemption, Period Three [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Unamortized Discount, Noncurrent (39)  
Unsecured Debt [Member] | Debt Instrument, Redemption, Period Four [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Unamortized Discount, Noncurrent (39)  
Unsecured Debt [Member] | Debt Instrument, Redemption, Period Five [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Unamortized Discount, Noncurrent (1,056)  
Secured Debt [Member]    
Debt Instrument [Line Items]    
2016 2,118  
2017 11,855  
2018 7,512  
2019 7,197  
2020 4,155  
2021 and thereafter 3,829  
Derivative, Amount of Hedged Item 10 (3)
Long-term debt 36,676 $ 45,268
Long-term Debt [Member] | Unsecured Debt [Member]    
Debt Instrument [Line Items]    
2016 19  
2017 4,365  
2018 3,700  
2019 1,662  
2020 2,212  
2021 and thereafter 9,078  
Derivative, Amount of Hedged Item 471  
Long-term debt 21,507  
original issue discount [Member] | Unsecured Debt [Member]    
Debt Instrument [Line Items]    
Derivative, Amount of Hedged Item $ 0