v3.26.3
Debt Debt (Narrative) (Details) - USD ($)
$ in Millions
9 Months Ended
May 20, 2026
Sep. 30, 2026
Jul. 20, 2026
Mar. 26, 2026
Dec. 31, 2025
Debt          
Debt Instrument [Line Items]          
Debt financing cost   $ 22     $ 16
Sierra Timeshare 2026-1 [Member]          
Debt Instrument [Line Items]          
Debt instrument, face amount       $ 325  
Long-Term Debt, Percentage Bearing Fixed Interest, Percentage Rate       5.11%  
Debt Instrument, Advance Rate       98.00%  
6.25% Secured notes due June 2031 | Debt          
Debt Instrument [Line Items]          
Debt instrument, face amount $ 900 900      
Debt financing cost 10        
Payments of Debt Restructuring Costs $ 2 $ 2      
Sierra Timeshare 2026-2          
Debt Instrument [Line Items]          
Debt instrument, face amount     $ 300    
Long-Term Debt, Percentage Bearing Fixed Interest, Percentage Rate     5.52%    
Debt Instrument, Advance Rate     98.00%