v3.26.3
Financial Instruments (Cost and Fair Value of Available-For-Sale Debt Securities) (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Available-for-sale debt securities    
Cost $ 210 $ 203
Fair Value 207 204
Cost    
Within one year 35 63
One to five years 159 128
Six to ten years 8 2
After ten years 8 10
Cost 210 203
Fair Value    
Within one year 35 63
One to five years 157 129
Six to ten years 7 2
After ten years 8 10
Fair Value 207 204
Corporate bonds    
Available-for-sale debt securities    
Cost 104 108
Fair Value 103 109
Cost    
Cost 104 108
Fair Value    
Fair Value 103 109
U.S. government treasury securities    
Available-for-sale debt securities    
Cost 45 37
Fair Value 44 37
Cost    
Cost 45 37
Fair Value    
Fair Value 44 37
U.S. federal agency securities    
Available-for-sale debt securities    
Cost 15 13
Fair Value 14 13
Cost    
Cost 15 13
Fair Value    
Fair Value 14 13
Asset-backed securities    
Available-for-sale debt securities    
Cost 41 37
Fair Value 41 37
Cost    
Cost 41 37
Fair Value    
Fair Value 41 37
Supranational securities    
Available-for-sale debt securities    
Cost 5 8
Fair Value 5 8
Cost    
Cost 5 8
Fair Value    
Fair Value $ 5 $ 8