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Debt (Scheduled Remaining Maturity of Long-term Debt) (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Long-term debt, maturities, repayments of principal in next 12 months $ 3,020  
Long-term debt, maturities, repayments of principal in year two 9,901  
Long-term debt, maturities, repayments of principal in year three 6,501  
Long-term debt, maturities, repayments of principal in year four 1,390  
Long-term debt, maturities, repayments of principal in year five 1,508  
Long-term debt, maturities, repayments of principal after year five 6,856  
Total long-term debt 29,176 $ 34,027
Unsecured debt    
Debt Instrument [Line Items]    
Long-term debt, maturities, repayments of principal in next 12 months 449  
Long-term debt, maturities, repayments of principal in year two 648  
Long-term debt, maturities, repayments of principal in year three 1,066  
Long-term debt, maturities, repayments of principal in year four 802  
Long-term debt, maturities, repayments of principal in year five 1,406  
Long-term debt, maturities, repayments of principal after year five 6,838  
Total long-term debt 11,209 11,204
Secured debt    
Debt Instrument [Line Items]    
Total long-term debt 17,967 $ 22,823
Long-term debt | Unsecured debt    
Debt Instrument [Line Items]    
Long-term debt, maturities, repayments of principal in next 12 months 474  
Long-term debt, maturities, repayments of principal in year two 701  
Long-term debt, maturities, repayments of principal in year three 1,123  
Long-term debt, maturities, repayments of principal in year four 865  
Long-term debt, maturities, repayments of principal in year five 1,475  
Long-term debt, maturities, repayments of principal after year five 7,663  
Total long-term debt 12,301  
Long-term debt | Secured debt    
Debt Instrument [Line Items]    
Long-term debt, maturities, repayments of principal in next 12 months 2,571  
Long-term debt, maturities, repayments of principal in year two 9,253  
Long-term debt, maturities, repayments of principal in year three 5,435  
Long-term debt, maturities, repayments of principal in year four 588  
Long-term debt, maturities, repayments of principal in year five 102  
Long-term debt, maturities, repayments of principal after year five 18  
Total long-term debt 17,967  
Original issue discount | Unsecured debt    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, current (25)  
Debt instrument, unamortized discount (1,092)  
Original issue discount | Unsecured debt | Debt instrument, redemption, period two    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent (53)  
Original issue discount | Unsecured debt | Debt instrument, redemption, period three    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent (57)  
Original issue discount | Unsecured debt | Debt Instrument, redemption, period four    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent (63)  
Original issue discount | Unsecured debt | Debt Instrument, redemption, period five    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent (69)  
Original issue discount | Unsecured debt | Debt instrument, redemption, period six    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent $ (825)