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Debt (Scheduled Remaining Maturity of Long-term Debt) (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months $ 7,835  
Long-term Debt, Maturities, Repayments of Principal in Year Two 9,108  
Long-term Debt, Maturities, Repayments of Principal in Year Three 9,057  
Long-term Debt, Maturities, Repayments of Principal in Year Four 6,324  
Long-term Debt, Maturities, Repayments of Principal in Year Five 5,113  
Long-term Debt, Maturities, Repayments of Principal after Year Five 7,512  
Derivative, Amount of Hedged Item 127 $ 208
Long-term debt 45,076 44,226
Unsecured Debt [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 2,911  
Long-term Debt, Maturities, Repayments of Principal in Year Two 1,641  
Long-term Debt, Maturities, Repayments of Principal in Year Three 2,212  
Long-term Debt, Maturities, Repayments of Principal in Year Four 607  
Long-term Debt, Maturities, Repayments of Principal in Year Five 1,019  
Long-term Debt, Maturities, Repayments of Principal after Year Five 6,444  
Derivative, Amount of Hedged Item 190 240
Long-term debt 15,024 15,631
Secured Debt [Member]    
Debt Instrument [Line Items]    
Derivative, Amount of Hedged Item (63) (32)
Long-term debt 30,052 $ 28,595
Long-term Debt [Member] | Unsecured Debt [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 2,987  
Long-term Debt, Maturities, Repayments of Principal in Year Two 1,680  
Long-term Debt, Maturities, Repayments of Principal in Year Three 2,251  
Long-term Debt, Maturities, Repayments of Principal in Year Four 650  
Long-term Debt, Maturities, Repayments of Principal in Year Five 1,066  
Long-term Debt, Maturities, Repayments of Principal after Year Five 7,411  
Derivative, Amount of Hedged Item 190  
Long-term debt 16,235  
Long-term Debt [Member] | Secured Debt [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 4,924  
Long-term Debt, Maturities, Repayments of Principal in Year Two 7,467  
Long-term Debt, Maturities, Repayments of Principal in Year Three 6,845  
Long-term Debt, Maturities, Repayments of Principal in Year Four 5,717  
Long-term Debt, Maturities, Repayments of Principal in Year Five 4,094  
Long-term Debt, Maturities, Repayments of Principal after Year Five 1,068  
Derivative, Amount of Hedged Item (63)  
Long-term debt 30,052  
original issue discount [Member] | Unsecured Debt [Member]    
Debt Instrument [Line Items]    
Derivative, Amount of Hedged Item 0  
Debt Instrument, Unamortized Discount, Current (76)  
Debt Instrument, Unamortized Discount (1,211)  
original issue discount [Member] | Unsecured Debt [Member] | Debt Instrument, Redemption, Period Two [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Unamortized Discount, Noncurrent (39)  
original issue discount [Member] | Unsecured Debt [Member] | Debt Instrument, Redemption, Period Three [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Unamortized Discount, Noncurrent (39)  
original issue discount [Member] | Unsecured Debt [Member] | Debt Instrument, Redemption, Period Four [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Unamortized Discount, Noncurrent (43)  
original issue discount [Member] | Unsecured Debt [Member] | Debt Instrument, Redemption, Period Five [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Unamortized Discount, Noncurrent (47)  
original issue discount [Member] | Unsecured Debt [Member] | Debt Instrument, Redemption, Period Six [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Unamortized Discount, Noncurrent $ (967)