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Debt (Scheduled Remaining Maturity of Long-term Debt) (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]    
Long-term debt, maturities, repayments of principal in next 12 months $ 4,418  
Long-term debt, maturities, repayments of principal in year two 4,336  
Long-term debt, maturities, repayments of principal in year three 3,818  
Long-term debt, maturities, repayments of principal in year four 835  
Long-term debt, maturities, repayments of principal in year five 1,522  
Long-term debt, maturities, repayments of principal after year five 2,833  
Total long-term debt 17,762 $ 17,029
Unsecured debt    
Debt Instrument [Line Items]    
Long-term debt, maturities, repayments of principal in next 12 months 2,023  
Long-term debt, maturities, repayments of principal in year two 1,406  
Long-term debt, maturities, repayments of principal in year three 2,398  
Long-term debt, maturities, repayments of principal in year four (59)  
Long-term debt, maturities, repayments of principal in year five 1,446  
Long-term debt, maturities, repayments of principal after year five 2,823  
Total long-term debt 10,037 9,410
Secured debt    
Debt Instrument [Line Items]    
Total long-term debt 7,725 $ 7,619
Long-term debt | Unsecured debt    
Debt Instrument [Line Items]    
Long-term debt, maturities, repayments of principal in next 12 months 2,084  
Long-term debt, maturities, repayments of principal in year two 1,474  
Long-term debt, maturities, repayments of principal in year three 2,471  
Long-term debt, maturities, repayments of principal in year four 23  
Long-term debt, maturities, repayments of principal in year five 1,539  
Long-term debt, maturities, repayments of principal after year five 3,328  
Total long-term debt 10,919  
Long-term debt | Secured debt    
Debt Instrument [Line Items]    
Long-term debt, maturities, repayments of principal in next 12 months 2,395  
Long-term debt, maturities, repayments of principal in year two 2,930  
Long-term debt, maturities, repayments of principal in year three 1,420  
Long-term debt, maturities, repayments of principal in year four 894  
Long-term debt, maturities, repayments of principal in year five 76  
Long-term debt, maturities, repayments of principal after year five 10  
Total long-term debt 7,725  
Original issue discount | Unsecured debt    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount (882)  
Original issue discount | Unsecured debt | 2023    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, current (61)  
Original issue discount | Unsecured debt | 2024    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent (68)  
Original issue discount | Unsecured debt | 2025    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent (73)  
Original issue discount | Unsecured debt | 2026    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent (82)  
Original issue discount | Unsecured debt | 2027    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent (93)  
Original issue discount | Unsecured debt | 2028 and thereafter    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent $ (505)