v3.26.1
Fair Value Measurements - Recurring (Detail) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Available-for-sale securities [Member]    
Fair Value    
Investment maturity 9 years 9 years
Fair Value, Recurring [Member]    
Fair Value    
Total assets measured at fair value $ 1,186 $ 707
Fair Value, Recurring [Member] | Quoted Prices in Active Markets (Level 1) [Member]    
Fair Value    
Cash equivalents and money market funds 424 91
Fair Value, Recurring [Member] | Quoted Prices in Active Markets (Level 1) [Member] | Equity securities [Member]    
Fair Value    
Investments 92 88
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Available-for-sale securities [Member]    
Fair Value    
Investments $ 670 $ 528