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Debt (Scheduled Remaining Maturity of Long-term Debt) (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months $ 6,569  
Long-term Debt, Maturities, Repayments of Principal in Year Two 11,528  
Long-term Debt, Maturities, Repayments of Principal in Year Three 10,252  
Long-term Debt, Maturities, Repayments of Principal in Year Four 8,319  
Long-term Debt, Maturities, Repayments of Principal in Year Five 3,161  
Long-term Debt, Maturities, Repayments of Principal after Year Five 9,016  
Derivative, Amount of Hedged Item 300 $ 315
Long-term debt 49,145 54,128
Unsecured Debt [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 1,745  
Long-term Debt, Maturities, Repayments of Principal in Year Two 3,600  
Long-term Debt, Maturities, Repayments of Principal in Year Three 1,642  
Long-term Debt, Maturities, Repayments of Principal in Year Four 2,210  
Long-term Debt, Maturities, Repayments of Principal in Year Five 595  
Long-term Debt, Maturities, Repayments of Principal after Year Five 7,459  
Derivative, Amount of Hedged Item 309 326
Long-term debt 17,560 20,050
Debt Instrument, Unamortized Discount (47)  
Debt Instrument, Unamortized Discount (1,282)  
Unsecured Debt [Member] | Debt Instrument, Redemption, Period One [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Unamortized Discount, Noncurrent (100)  
Unsecured Debt [Member] | Debt Instrument, Redemption, Period Two [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Unamortized Discount, Noncurrent (39)  
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 (43)  
Unsecured Debt [Member] | Debt Instrument, Redemption, Period Five [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Unamortized Discount, Noncurrent (1,014)  
Secured Debt [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 4,824  
Long-term Debt, Maturities, Repayments of Principal in Year Two 7,928  
Long-term Debt, Maturities, Repayments of Principal in Year Three 8,610  
Long-term Debt, Maturities, Repayments of Principal in Year Four 6,109  
Long-term Debt, Maturities, Repayments of Principal in Year Five 2,566  
Long-term Debt, Maturities, Repayments of Principal after Year Five 1,557  
Derivative, Amount of Hedged Item (9) (11)
Long-term debt 31,585 $ 34,078
Long-term Debt [Member] | Unsecured Debt [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 1,792  
Long-term Debt, Maturities, Repayments of Principal in Year Two 3,700  
Long-term Debt, Maturities, Repayments of Principal in Year Three 1,681  
Long-term Debt, Maturities, Repayments of Principal in Year Four 2,249  
Long-term Debt, Maturities, Repayments of Principal in Year Five 638  
Long-term Debt, Maturities, Repayments of Principal after Year Five 8,473  
Derivative, Amount of Hedged Item 309  
Long-term debt 18,842  
original issue discount [Member] | Unsecured Debt [Member]    
Debt Instrument [Line Items]    
Derivative, Amount of Hedged Item $ 0