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Debt (Scheduled Remaining Maturity of Long-term Debt) (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Long-term debt, maturities, repayments of principal in next 12 months $ 3,815  
Long-term debt, maturities, repayments of principal in year two 9,092  
Long-term debt, maturities, repayments of principal in year three 10,043  
Long-term debt, maturities, repayments of principal in year four 6,459  
Long-term debt, maturities, repayments of principal in year five 511  
Long-term debt, maturities, repayments of principal after year five 7,546  
Total long-term debt 37,466 $ 44,193
Unsecured debt    
Debt Instrument [Line Items]    
Long-term debt, maturities, repayments of principal in next 12 months 852  
Long-term debt, maturities, repayments of principal in year two 2,213  
Long-term debt, maturities, repayments of principal in year three 650  
Long-term debt, maturities, repayments of principal in year four 1,033  
Long-term debt, maturities, repayments of principal in year five (46)  
Long-term debt, maturities, repayments of principal after year five 7,369  
Total long-term debt 12,071 12,107
Secured debt    
Debt Instrument [Line Items]    
Total long-term debt 25,395 $ 32,086
Long-term debt | Unsecured debt    
Debt Instrument [Line Items]    
Long-term debt, maturities, repayments of principal in next 12 months 873  
Long-term debt, maturities, repayments of principal in year two 2,256  
Long-term debt, maturities, repayments of principal in year three 696  
Long-term debt, maturities, repayments of principal in year four 1,084  
Long-term debt, maturities, repayments of principal in year five 11  
Long-term debt, maturities, repayments of principal after year five 8,273  
Total long-term debt 13,193  
Long-term debt | Secured debt    
Debt Instrument [Line Items]    
Long-term debt, maturities, repayments of principal in next 12 months 2,963  
Long-term debt, maturities, repayments of principal in year two 6,879  
Long-term debt, maturities, repayments of principal in year three 9,393  
Long-term debt, maturities, repayments of principal in year four 5,426  
Long-term debt, maturities, repayments of principal in year five 557  
Long-term debt, maturities, repayments of principal after year five 177  
Total long-term debt 25,395  
Original issue discount | Unsecured debt    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, current (21)  
Debt instrument, unamortized discount (1,122)  
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 (46)  
Original issue discount | Unsecured debt | Debt Instrument, redemption, period four    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent (51)  
Original issue discount | Unsecured debt | Debt Instrument, redemption, period five    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent (57)  
Original issue discount | Unsecured debt | Debt instrument, redemption, period six    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent $ (904)