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Debt (Scheduled Remaining Maturity of Long-term Debt) (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Long-term debt, maturities, repayments of principal in next 12 months $ 5,884  
Long-term debt, maturities, repayments of principal in year two 9,126  
Long-term debt, maturities, repayments of principal in year three 10,837  
Long-term debt, maturities, repayments of principal in year four 7,034  
Long-term debt, maturities, repayments of principal in year five 1,192  
Long-term debt, maturities, repayments of principal after year five 7,417  
Total long-term debt 41,490 $ 44,193
Unsecured debt    
Debt Instrument [Line Items]    
Long-term debt, maturities, repayments of principal in next 12 months 886  
Long-term debt, maturities, repayments of principal in year two 2,217  
Long-term debt, maturities, repayments of principal in year three 652  
Long-term debt, maturities, repayments of principal in year four 1,026  
Long-term debt, maturities, repayments of principal in year five (44)  
Long-term debt, maturities, repayments of principal after year five 6,601  
Total long-term debt 11,338 12,107
Secured debt    
Debt Instrument [Line Items]    
Total long-term debt 30,152 $ 32,086
Long-term debt | Unsecured debt    
Debt Instrument [Line Items]    
Long-term debt, maturities, repayments of principal in next 12 months 917  
Long-term debt, maturities, repayments of principal in year two 2,258  
Long-term debt, maturities, repayments of principal in year three 697  
Long-term debt, maturities, repayments of principal in year four 1,075  
Long-term debt, maturities, repayments of principal in year five 12  
Long-term debt, maturities, repayments of principal after year five 7,504  
Total long-term debt 12,463  
Long-term debt | Secured debt    
Debt Instrument [Line Items]    
Long-term debt, maturities, repayments of principal in next 12 months 4,998  
Long-term debt, maturities, repayments of principal in year two 6,909  
Long-term debt, maturities, repayments of principal in year three 10,185  
Long-term debt, maturities, repayments of principal in year four 6,008  
Long-term debt, maturities, repayments of principal in year five 1,236  
Long-term debt, maturities, repayments of principal after year five 816  
Total long-term debt 30,152  
Original issue discount | Unsecured debt    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, current (31)  
Debt instrument, unamortized discount (1,125)  
Original issue discount | Unsecured debt | Debt instrument, redemption, period two    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent (41)  
Original issue discount | Unsecured debt | Debt instrument, redemption, period three    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent (45)  
Original issue discount | Unsecured debt | Debt Instrument, redemption, period four    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent (49)  
Original issue discount | Unsecured debt | Debt Instrument, redemption, period five    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent (56)  
Original issue discount | Unsecured debt | Debt instrument, redemption, period six    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent $ (903)