Annual report [Section 13 and 15(d), not S-K Item 405]

Summary of Significant Accounting Policies (Narrative) (Details)

v3.25.4
Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)
shares in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Accrued expenses and other current liabilities $ 290,000,000 $ 265,000,000  
Accrued expenses and other current liabilities 201,000,000 186,000,000  
Cumulative-effect benefit to retained earnings $ 471,000,000 654,000,000  
Treasury Stock, Shares, Retired 28    
Impairment $ 86,000,000 12,000,000 $ 0
Accrued loyalty program liabilities 73,000,000 65,000,000  
Additional paid-in capital 14,000,000 1,647,000,000  
Development advance notes      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Impairment 48,000,000 10,000,000 $ 0
Vienna House Franchise Rights      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Impairment 12,000,000    
Vienna House Trademark      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Impairment 26,000,000    
Treasury Stock, Common      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Stock Repurchased and Retired During Period, Value 1,914,000,000    
Additional Paid-in Capital      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Stock Repurchased and Retired During Period, Value 1,665,000,000    
Retained Earnings/(Accumulated Deficit)      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Stock Repurchased and Retired During Period, Value 249,000,000    
Deferred loyalty program revenue      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Loyalty program liability 118,000,000 105,000,000  
Accrued expenses and other current liabilities   65,000,000  
Accrued expenses and other current liabilities $ 45,000,000 $ 40,000,000  
Maximum      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Historical collection attrition rate, period 10 years