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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Earnings Per Share [Abstract]        
Net income attributable to stockholders of UL Solutions $ 100 $ 88 $ 258 $ 245
Basic weighted average common shares outstanding (in shares) 201 200 201 200
Effect of dilutive securities (in shares) 2 2 2 1
Diluted weighted average common shares outstanding (in shares) 203 202 203 201
Basic earnings per share attributable to stockholder of UL Solutions (in dollars per share) $ 0.50 $ 0.44 $ 1.28 $ 1.23
Diluted earnings per share attributable to stockholder of UL Solutions (in dollars per share) $ 0.49 $ 0.44 $ 1.27 $ 1.22