v3.26.1
Background and Basis of Presentation (Background Narrative) (Details) - USD ($)
$ / shares in Units, shares in Millions
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Oct. 29, 2025
Jan. 31, 2025
Schedule of Equity Method Investments [Line Items]        
Treasury Stock, Value, Acquired, Cost Method $ 280,000,000 $ 326,000,000    
January 2025 Share Repurchase Program [Member]        
Schedule of Equity Method Investments [Line Items]        
Stock repurchase program, authorized amount     $ 2,000,000,000.0 $ 1,000,000,000.0
Repurchase of common stock (in shares) 4.5      
Treasury Stock, Value, Acquired, Cost Method $ 280,000,000      
Average price per share of shares repurchased (USD per share) $ 62.33      
Stock repurchase program, remaining authorized repurchase amount $ 720,000,000      
January 2024 Share Repurchase Program [Member]        
Schedule of Equity Method Investments [Line Items]        
Repurchase of common stock (in shares)   5.7    
Treasury Stock, Value, Acquired, Cost Method   $ 326,000,000    
Average price per share of shares repurchased (USD per share)   $ 56.97    
Horizon {Member] | PM USA [Member]        
Schedule of Equity Method Investments [Line Items]        
Ownership percentage in consolidated subsidiary 75.00%      
Horizon {Member] | JTIUH [Member]        
Schedule of Equity Method Investments [Line Items]        
Noncontrolling interest, ownership percentage by noncontrolling owners 25.00%