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Debt (Scheduled Remaining Maturity of Long-term Debt) (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Long-term debt, maturities, repayments of principal in next 12 months $ 2,309  
Long-term debt, maturities, repayments of principal in year two 8,910  
Long-term debt, maturities, repayments of principal in year three 9,993  
Long-term debt, maturities, repayments of principal in year four 6,460  
Long-term debt, maturities, repayments of principal in year five 495  
Long-term debt, maturities, repayments of principal after year five 7,563  
Total long-term debt 35,730 $ 44,193
Unsecured debt    
Debt Instrument [Line Items]    
Long-term debt, maturities, repayments of principal in next 12 months 823  
Long-term debt, maturities, repayments of principal in year two 2,215  
Long-term debt, maturities, repayments of principal in year three 651  
Long-term debt, maturities, repayments of principal in year four 1,043  
Long-term debt, maturities, repayments of principal in year five (44)  
Long-term debt, maturities, repayments of principal after year five 7,405  
Total long-term debt 12,093 12,107
Secured debt    
Debt Instrument [Line Items]    
Total long-term debt 23,637 $ 32,086
Long-term debt | Unsecured debt    
Debt Instrument [Line Items]    
Long-term debt, maturities, repayments of principal in next 12 months 834  
Long-term debt, maturities, repayments of principal in year two 2,258  
Long-term debt, maturities, repayments of principal in year three 699  
Long-term debt, maturities, repayments of principal in year four 1,095  
Long-term debt, maturities, repayments of principal in year five 15  
Long-term debt, maturities, repayments of principal after year five 8,303  
Total long-term debt 13,204  
Long-term debt | Secured debt    
Debt Instrument [Line Items]    
Long-term debt, maturities, repayments of principal in next 12 months 1,486  
Long-term debt, maturities, repayments of principal in year two 6,695  
Long-term debt, maturities, repayments of principal in year three 9,342  
Long-term debt, maturities, repayments of principal in year four 5,417  
Long-term debt, maturities, repayments of principal in year five 539  
Long-term debt, maturities, repayments of principal after year five 158  
Total long-term debt 23,637  
Original issue discount | Unsecured debt    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, current (11)  
Debt instrument, unamortized discount (1,111)  
Original issue discount | Unsecured debt | Debt instrument, redemption, period two    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent (43)  
Original issue discount | Unsecured debt | Debt instrument, redemption, period three    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent (48)  
Original issue discount | Unsecured debt | Debt Instrument, redemption, period four    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent (52)  
Original issue discount | Unsecured debt | Debt Instrument, redemption, period five    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent (59)  
Original issue discount | Unsecured debt | Debt instrument, redemption, period six    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent $ (898)