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Fair Value of Financial Instruments - Estimated Carrying Amounts of Fair Value of Financial Instruments not Carried at Fair Value (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Liabilities    
Long-term debt $ 8,100 $ 8,100
Carrying Amount    
Liabilities    
Long-term debt 8,098 8,040
Carrying Amount | Senior Debt Obligations    
Liabilities    
Long-term debt 575 518
Carrying Amount | Other Debt Obligations    
Liabilities    
Long-term debt 7,523 7,522
Fair Value    
Liabilities    
Long-term debt 7,008 8,327
Fair Value | Senior Debt Obligations    
Liabilities    
Long-term debt 576 677
Fair Value | Other Debt Obligations    
Liabilities    
Long-term debt $ 6,432 $ 7,650