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Debt (Scheduled Remaining Maturity of Long-term Debt) (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Long-term debt, maturities, repayments of principal in next 12 months $ 6,320  
Long-term debt, maturities, repayments of principal in year two 9,279  
Long-term debt, maturities, repayments of principal in year three 6,915  
Long-term debt, maturities, repayments of principal in year four 762  
Long-term debt, maturities, repayments of principal in year five 1,615  
Long-term debt, maturities, repayments of principal after year five 6,175  
Total long-term debt 31,066 $ 34,027
Unsecured debt    
Debt Instrument [Line Items]    
Long-term debt, maturities, repayments of principal in next 12 months 473  
Long-term debt, maturities, repayments of principal in year two 654  
Long-term debt, maturities, repayments of principal in year three 1,072  
Long-term debt, maturities, repayments of principal in year four (33)  
Long-term debt, maturities, repayments of principal in year five 1,408  
Long-term debt, maturities, repayments of principal after year five 6,070  
Total long-term debt 9,644 11,204
Secured debt    
Debt Instrument [Line Items]    
Total long-term debt 21,422 $ 22,823
Long-term debt | Unsecured debt    
Debt Instrument [Line Items]    
Long-term debt, maturities, repayments of principal in next 12 months 507  
Long-term debt, maturities, repayments of principal in year two 703  
Long-term debt, maturities, repayments of principal in year three 1,125  
Long-term debt, maturities, repayments of principal in year four 27  
Long-term debt, maturities, repayments of principal in year five 1,475  
Long-term debt, maturities, repayments of principal after year five 6,896  
Total long-term debt 10,733  
Long-term debt | Secured debt    
Debt Instrument [Line Items]    
Long-term debt, maturities, repayments of principal in next 12 months 5,847  
Long-term debt, maturities, repayments of principal in year two 8,625  
Long-term debt, maturities, repayments of principal in year three 5,843  
Long-term debt, maturities, repayments of principal in year four 795  
Long-term debt, maturities, repayments of principal in year five 207  
Long-term debt, maturities, repayments of principal after year five 105  
Total long-term debt 21,422  
Original issue discount | Unsecured debt    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, current (34)  
Debt instrument, unamortized discount (1,089)  
Original issue discount | Unsecured debt | Debt instrument, redemption, period two    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent (49)  
Original issue discount | Unsecured debt | Debt instrument, redemption, period three    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent (53)  
Original issue discount | Unsecured debt | Debt Instrument, redemption, period four    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent (60)  
Original issue discount | Unsecured debt | Debt Instrument, redemption, period five    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent (67)  
Original issue discount | Unsecured debt | Debt instrument, redemption, period six    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent $ (826)