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Debt (Scheduled Remaining Maturity of Long-term Debt) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Long-term debt, maturities, repayments of principal in next 12 months $ 9,219  
Long-term debt, maturities, repayments of principal in year two 10,180  
Long-term debt, maturities, repayments of principal in year three 6,621  
Long-term debt, maturities, repayments of principal in year four 559  
Long-term debt, maturities, repayments of principal in year five 1,512  
Long-term debt, maturities, repayments of principal after year five 5,936  
Total long-term debt 34,027 $ 44,193
Unsecured debt    
Debt Instrument [Line Items]    
Long-term debt, maturities, repayments of principal in next 12 months 2,214  
Long-term debt, maturities, repayments of principal in year two 650  
Long-term debt, maturities, repayments of principal in year three 1,069  
Long-term debt, maturities, repayments of principal in year four (68)  
Long-term debt, maturities, repayments of principal in year five 1,405  
Long-term debt, maturities, repayments of principal after year five 5,934  
Total long-term debt 11,204 12,107
Secured debt    
Debt Instrument [Line Items]    
Total long-term debt 22,823 $ 32,086
Long-term debt | Unsecured debt    
Debt Instrument [Line Items]    
Long-term debt, maturities, repayments of principal in next 12 months 2,258  
Long-term debt, maturities, repayments of principal in year two 697  
Long-term debt, maturities, repayments of principal in year three 1,121  
Long-term debt, maturities, repayments of principal in year four (9)  
Long-term debt, maturities, repayments of principal in year five 1,470  
Long-term debt, maturities, repayments of principal after year five 6,767  
Total long-term debt 12,304  
Long-term debt | Secured debt    
Debt Instrument [Line Items]    
Long-term debt, maturities, repayments of principal in next 12 months 7,005  
Long-term debt, maturities, repayments of principal in year two 9,530  
Long-term debt, maturities, repayments of principal in year three 5,552  
Long-term debt, maturities, repayments of principal in year four 627  
Long-term debt, maturities, repayments of principal in year five 107  
Long-term debt, maturities, repayments of principal after year five 2  
Total long-term debt 22,823  
Original issue discount | Unsecured debt    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, current (44)  
Debt instrument, unamortized discount (1,100)  
Original issue discount | Unsecured debt | Debt instrument, redemption, period two    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent (47)  
Original issue discount | Unsecured debt | Debt instrument, redemption, period three    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent (52)  
Original issue discount | Unsecured debt | Debt Instrument, redemption, period four    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent (59)  
Original issue discount | Unsecured debt | Debt Instrument, redemption, period five    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent (65)  
Original issue discount | Unsecured debt | Debt instrument, redemption, period six    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent $ (833)