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Debt (Scheduled Remaining Maturity of Long-term Debt) (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Debt Instrument [Line Items]    
Long-term debt, maturities, repayments of principal in next 12 months $ 2,071  
Long-term debt, maturities, repayments of principal in year two 4,025  
Long-term debt, maturities, repayments of principal in year three 3,836  
Long-term debt, maturities, repayments of principal in year four 3,211  
Long-term debt, maturities, repayments of principal in year five 285  
Long-term debt, maturities, repayments of principal after year five 3,556  
Total long-term debt 16,984 $ 17,029
Unsecured debt    
Debt Instrument [Line Items]    
Long-term debt, maturities, repayments of principal in next 12 months 4  
Long-term debt, maturities, repayments of principal in year two 2,023  
Long-term debt, maturities, repayments of principal in year three 1,413  
Long-term debt, maturities, repayments of principal in year four 2,319  
Long-term debt, maturities, repayments of principal in year five (55)  
Long-term debt, maturities, repayments of principal after year five 3,471  
Total long-term debt 9,175 9,410
Secured debt    
Debt Instrument [Line Items]    
Total long-term debt 7,809 $ 7,619
Long-term debt | Unsecured debt    
Debt Instrument [Line Items]    
Long-term debt, maturities, repayments of principal in next 12 months 31  
Long-term debt, maturities, repayments of principal in year two 2,082  
Long-term debt, maturities, repayments of principal in year three 1,479  
Long-term debt, maturities, repayments of principal in year four 2,391  
Long-term debt, maturities, repayments of principal in year five 25  
Long-term debt, maturities, repayments of principal after year five 4,068  
Total long-term debt 10,076  
Long-term debt | Secured debt    
Debt Instrument [Line Items]    
Long-term debt, maturities, repayments of principal in next 12 months 2,067  
Long-term debt, maturities, repayments of principal in year two 2,002  
Long-term debt, maturities, repayments of principal in year three 2,423  
Long-term debt, maturities, repayments of principal in year four 892  
Long-term debt, maturities, repayments of principal in year five 340  
Long-term debt, maturities, repayments of principal after year five 85  
Total long-term debt 7,809  
Original issue discount | Unsecured debt    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount (901)  
Original issue discount | Unsecured debt | 2022    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, current (27)  
Original issue discount | Unsecured debt | 2023    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent (59)  
Original issue discount | Unsecured debt | 2024    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent (66)  
Original issue discount | Unsecured debt | 2025    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent (72)  
Original issue discount | Unsecured debt | 2026    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent (80)  
Original issue discount | Unsecured debt | 2027 and thereafter    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent $ (597)