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Debt (Scheduled Remaining Maturity of Long-term Debt) (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months $ 5,295  
Long-term Debt, Maturities, Repayments of Principal in Year Two 9,638  
Long-term Debt, Maturities, Repayments of Principal in Year Three 9,642  
Long-term Debt, Maturities, Repayments of Principal in Year Four 9,104  
Long-term Debt, Maturities, Repayments of Principal in Year Five 5,581  
Long-term Debt, Maturities, Repayments of Principal after Year Five 7,969  
Derivative, Amount of Hedged Item 99  
Long-term Debt 47,328 $ 44,226
Unsecured Debt [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 1,939  
Long-term Debt, Maturities, Repayments of Principal in Year Two 1,643  
Long-term Debt, Maturities, Repayments of Principal in Year Three 2,212  
Long-term Debt, Maturities, Repayments of Principal in Year Four 620  
Long-term Debt, Maturities, Repayments of Principal in Year Five 1,019  
Long-term Debt, Maturities, Repayments of Principal after Year Five 6,446  
Derivative, Amount of Hedged Item 168  
Long-term Debt 14,047 15,631
Secured Debt [Member]    
Debt Instrument [Line Items]    
Long-term Debt 33,281 $ 28,595
Long-term Debt [Member] | Unsecured Debt [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 1,991  
Long-term Debt, Maturities, Repayments of Principal in Year Two 1,681  
Long-term Debt, Maturities, Repayments of Principal in Year Three 2,251  
Long-term Debt, Maturities, Repayments of Principal in Year Four 663  
Long-term Debt, Maturities, Repayments of Principal in Year Five 1,066  
Long-term Debt, Maturities, Repayments of Principal after Year Five 7,414  
Derivative, Amount of Hedged Item 168  
Long-term Debt 15,234  
Long-term Debt [Member] | Secured Debt [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 3,356  
Long-term Debt, Maturities, Repayments of Principal in Year Two 7,995  
Long-term Debt, Maturities, Repayments of Principal in Year Three 7,430  
Long-term Debt, Maturities, Repayments of Principal in Year Four 8,484  
Long-term Debt, Maturities, Repayments of Principal in Year Five 4,562  
Long-term Debt, Maturities, Repayments of Principal after Year Five 1,523  
Derivative, Amount of Hedged Item (69)  
Long-term Debt 33,281  
original issue discount [Member] | Unsecured Debt [Member]    
Debt Instrument [Line Items]    
Derivative, Amount of Hedged Item 0  
Debt Instrument, Unamortized Discount, Current (52)  
Debt Instrument, Unamortized Discount (1,187)  
original issue discount [Member] | Unsecured Debt [Member] | Debt Instrument, Redemption, Period Two [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Unamortized Discount, Noncurrent (38)  
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 $ (968)