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Debt (Scheduled Remaining Maturity of Long-term Debt) (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Long-term debt, maturities, repayments of principal in next 12 months $ 2,775  
Long-term debt, maturities, repayments of principal in year two 9,313  
Long-term debt, maturities, repayments of principal in year three 9,996  
Long-term debt, maturities, repayments of principal in year four 9,613  
Long-term debt, maturities, repayments of principal in year five 5,678  
Long-term debt, maturities, repayments of principal after year five 8,105  
Derivative, amount of hedged item 62  
Total long-term debt 45,542 $ 44,226
Unsecured debt    
Debt Instrument [Line Items]    
Long-term debt, maturities, repayments of principal in next 12 months 1,219  
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 636  
Long-term debt, maturities, repayments of principal in year five 1,019  
Long-term debt, maturities, repayments of principal after year five 6,449  
Derivative, amount of hedged item 135  
Total long-term debt 13,313 15,631
Secured debt    
Debt Instrument [Line Items]    
Total long-term debt 32,229 $ 28,595
Long-term debt | Unsecured debt    
Debt Instrument [Line Items]    
Long-term debt, maturities, repayments of principal in next 12 months 1,245  
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 679  
Long-term debt, maturities, repayments of principal in year five 1,066  
Long-term debt, maturities, repayments of principal after year five 7,417  
Derivative, amount of hedged item 135  
Total long-term debt 14,474  
Long-term debt | Secured debt    
Debt Instrument [Line Items]    
Long-term debt, maturities, repayments of principal in next 12 months 1,556  
Long-term debt, maturities, repayments of principal in year two 7,670  
Long-term debt, maturities, repayments of principal in year three 7,784  
Long-term debt, maturities, repayments of principal in year four 8,977  
Long-term debt, maturities, repayments of principal in year five 4,659  
Long-term debt, maturities, repayments of principal after year five 1,656  
Derivative, amount of hedged item (73)  
Total long-term debt 32,229  
Original issue discount | Unsecured debt    
Debt Instrument [Line Items]    
Derivative, amount of hedged item 0  
Debt instrument, unamortized discount, current (26)  
Debt instrument, unamortized discount (1,161)  
Original issue discount | Unsecured debt | Debt instrument, redemption, period two    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent (38)  
Original issue discount | Unsecured debt | Debt instrument, redemption, period three    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent (39)  
Original issue discount | Unsecured debt | Debt Instrument, redemption, period four    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent (43)  
Original issue discount | Unsecured debt | Debt Instrument, redemption, period five    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent (47)  
Original issue discount | Unsecured debt | Debt instrument, redemption, period six    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent $ (968)