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Debt (Scheduled Remaining Maturity of Long-term Debt) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Long-term debt, maturities, repayments of principal in next 12 months $ 8,976  
Long-term debt, maturities, repayments of principal in year two 9,579  
Long-term debt, maturities, repayments of principal in year three 10,848  
Long-term debt, maturities, repayments of principal in year four 6,341  
Long-term debt, maturities, repayments of principal in year five 1,186  
Long-term debt, maturities, repayments of principal after year five 7,263  
Total long-term debt 44,193 $ 44,226
Unsecured debt    
Debt Instrument [Line Items]    
Long-term debt, maturities, repayments of principal in next 12 months 1,663  
Long-term debt, maturities, repayments of principal in year two 2,216  
Long-term debt, maturities, repayments of principal in year three 653  
Long-term debt, maturities, repayments of principal in year four 1,020  
Long-term debt, maturities, repayments of principal in year five (44)  
Long-term debt, maturities, repayments of principal after year five 6,599  
Total long-term debt 12,107 15,631
Secured debt    
Debt Instrument [Line Items]    
Total long-term debt 32,086 $ 28,595
Long-term debt | Unsecured debt    
Debt Instrument [Line Items]    
Long-term debt, maturities, repayments of principal in next 12 months 1,704  
Long-term debt, maturities, repayments of principal in year two 2,257  
Long-term debt, maturities, repayments of principal in year three 698  
Long-term debt, maturities, repayments of principal in year four 1,069  
Long-term debt, maturities, repayments of principal in year five 12  
Long-term debt, maturities, repayments of principal after year five 7,502  
Total long-term debt 13,242  
Long-term debt | Secured debt    
Debt Instrument [Line Items]    
Long-term debt, maturities, repayments of principal in next 12 months 7,313  
Long-term debt, maturities, repayments of principal in year two 7,363  
Long-term debt, maturities, repayments of principal in year three 10,195  
Long-term debt, maturities, repayments of principal in year four 5,321  
Long-term debt, maturities, repayments of principal in year five 1,230  
Long-term debt, maturities, repayments of principal after year five 664  
Total long-term debt 32,086  
Original issue discount | Unsecured debt    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, current (41)  
Debt instrument, unamortized discount (1,135)  
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)