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Debt (Scheduled Remaining Maturity of Long-term Debt) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Long-term debt, maturities, repayments of principal in next 12 months $ 5,869  
Long-term debt, maturities, repayments of principal in year two 3,506  
Long-term debt, maturities, repayments of principal in year three 2,679  
Long-term debt, maturities, repayments of principal in year four 2,307  
Long-term debt, maturities, repayments of principal in year five (52)  
Long-term debt, maturities, repayments of principal after year five 2,720  
Total long-term debt 17,029 $ 22,006
Unsecured debt    
Debt Instrument [Line Items]    
Long-term debt, maturities, repayments of principal in next 12 months 1,028  
Long-term debt, maturities, repayments of principal in year two 2,024  
Long-term debt, maturities, repayments of principal in year three 1,416  
Long-term debt, maturities, repayments of principal in year four 2,284  
Long-term debt, maturities, repayments of principal in year five (52)  
Long-term debt, maturities, repayments of principal after year five 2,710  
Total long-term debt 9,410 12,014
Secured debt    
Debt Instrument [Line Items]    
Total long-term debt 7,619 $ 9,992
Long-term debt | Unsecured debt    
Debt Instrument [Line Items]    
Long-term debt, maturities, repayments of principal in next 12 months 1,081  
Long-term debt, maturities, repayments of principal in year two 2,082  
Long-term debt, maturities, repayments of principal in year three 1,481  
Long-term debt, maturities, repayments of principal in year four 2,355  
Long-term debt, maturities, repayments of principal in year five 27  
Long-term debt, maturities, repayments of principal after year five 3,307  
Total long-term debt 10,333  
Long-term debt | Secured debt    
Debt Instrument [Line Items]    
Long-term debt, maturities, repayments of principal in next 12 months 4,841  
Long-term debt, maturities, repayments of principal in year two 1,482  
Long-term debt, maturities, repayments of principal in year three 1,263  
Long-term debt, maturities, repayments of principal in year four 23  
Long-term debt, maturities, repayments of principal in year five 0  
Long-term debt, maturities, repayments of principal after year five 10  
Total long-term debt 7,619  
Original issue discount | Unsecured debt    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount (923)  
Original issue discount | Unsecured debt | 2022    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, current (53)  
Original issue discount | Unsecured debt | 2023    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent (58)  
Original issue discount | Unsecured debt | 2024    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent (65)  
Original issue discount | Unsecured debt | 2025    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent (71)  
Original issue discount | Unsecured debt | 2026    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent (79)  
Original issue discount | Unsecured debt | 2027 and thereafter    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, noncurrent $ (597)