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Debt (Scheduled Remaining Maturity of Long-term Debt) (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]    
Long-term debt, maturities, repayments of principal in next 12 months $ 3,830  
Long-term debt, maturities, repayments of principal in year two 3,629  
Long-term debt, maturities, repayments of principal in year three 3,164  
Long-term debt, maturities, repayments of principal in year four 2,581  
Long-term debt, maturities, repayments of principal in year five (44)  
Long-term debt, maturities, repayments of principal after year five 2,725  
Total long-term debt 15,885 $ 17,029
Unsecured debt    
Debt Instrument [Line Items]    
Long-term debt, maturities, repayments of principal in next 12 months 393  
Long-term debt, maturities, repayments of principal in year two 2,027  
Long-term debt, maturities, repayments of principal in year three 1,416  
Long-term debt, maturities, repayments of principal in year four 2,306  
Long-term debt, maturities, repayments of principal in year five (52)  
Long-term debt, maturities, repayments of principal after year five 2,715  
Total long-term debt 8,805 9,410
Secured debt    
Debt Instrument [Line Items]    
Total long-term debt 7,080 $ 7,619
Long-term debt | Unsecured debt    
Debt Instrument [Line Items]    
Long-term debt, maturities, repayments of principal in next 12 months 433  
Long-term debt, maturities, repayments of principal in year two 2,085  
Long-term debt, maturities, repayments of principal in year three 1,481  
Long-term debt, maturities, repayments of principal in year four 2,377  
Long-term debt, maturities, repayments of principal in year five 27  
Long-term debt, maturities, repayments of principal after year five 3,312  
Total long-term debt 9,715  
Long-term debt | Secured debt    
Debt Instrument [Line Items]    
Long-term debt, maturities, repayments of principal in next 12 months 3,437  
Long-term debt, maturities, repayments of principal in year two 1,602  
Long-term debt, maturities, repayments of principal in year three 1,748  
Long-term debt, maturities, repayments of principal in year four 275  
Long-term debt, maturities, repayments of principal in year five 8  
Long-term debt, maturities, repayments of principal after year five 10  
Total long-term debt 7,080  
Original issue discount | Unsecured debt    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount (910)  
Original issue discount | Unsecured debt | 2022    
Debt Instrument [Line Items]    
Debt instrument, unamortized discount, current (40)  
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)