v3.26.1
Fair Value Measurements - Additional Information (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Fair value measurements    
Cash, cash equivalents, and reserved funds, carrying value $ 737 $ 511
Long-term debt 1,700 1,700
Level 1    
Fair value measurements    
Cash, cash equivalents, and reserved funds, fair value 737 511
Level 2    
Fair value measurements    
Long-term debt, fair value $ 1,700 $ 1,600