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Restructuring (Tables)
 12 Months Ended
Dec. 31, 2025
Restructuring and Related Activities [Abstract]  
Schedule of Restructuring Reserve by Type of Cost
The following table presents the activity in the restructuring liability under the above and other ongoing plans for the years ended December 31, 2025 and 2024:

OPtiMa 3 Plan
($ millions)OPtiMa 3.1
OPtiMa 3.2
2021 Italian Workforce RedundanciesTotal
Balance at December 31, 2023— — 22 22 
Restructuring expense, net38 — — 39 
Cash payments(7)— (6)(12)
Other adjustments, net(2)— (1)(3)
Balance at December 31, 202429 — 16 46 
Restructuring expense, net(1)29 — 28 
Cash payments(20)(3)(5)(29)
Other adjustments, net(1)
3 — 2 5 
Balance at December 31, 202511 26 13 49 
Cumulative expense
37 29 32 98 
(1) Includes foreign currency translation adjustments