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Segments - Summary of Segment Profit (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2025
Amounts Allocated To Segments [Abstract]      
Consolidated operating income (loss) $ 519 $ (218)  
Amounts Not Allocated To Segments [Abstract]      
Amortization 145 152  
Other asset impairments, restructuring and other items (22) 673  
Intangible assets impairments 121 80  
Legal settlements and loss contingencies 83 106  
Other Unallocated Amounts 99 99  
Revenues 3,891 3,819  
Cost of Sales 2,014 2,048  
R&D expenses 247 242  
S&M expenses 622 608  
G&A expenses 297 278  
Segment profit 519 (218)  
Financial expenses, net 225 250  
Consolidated income (loss) before income taxes 294 (467)  
United States [Member]      
Amounts Allocated To Segments [Abstract]      
Consolidated operating income (loss) 532 350 $ 532
Amounts Not Allocated To Segments [Abstract]      
Revenues 1,910 1,725  
Cost of Sales 851 867  
R&D expenses 154 154  
S&M expenses 273 261  
G&A expenses 96 93  
Other loss (income) 3 1  
Segment profit 532 350 532
Europe [Member]      
Amounts Allocated To Segments [Abstract]      
Consolidated operating income (loss) 329 423 329
Amounts Not Allocated To Segments [Abstract]      
Revenues 1,194 1,272  
Cost of Sales 536 534  
R&D expenses 60 56  
S&M expenses 199 194  
G&A expenses 69 65  
Other loss (income)   1  
Segment profit 329 423 329
International Markets [Member]      
Amounts Allocated To Segments [Abstract]      
Consolidated operating income (loss) 97 117 97
Amounts Not Allocated To Segments [Abstract]      
Revenues 582 597  
Cost of Sales 304 300  
R&D expenses 25 28  
S&M expenses 118 118  
G&A expenses 39 35  
Other loss (income) (1)    
Segment profit $ 97 117 97
Corporate Segment [Member]      
Amounts Allocated To Segments [Abstract]      
Consolidated operating income (loss)   890 958
Amounts Not Allocated To Segments [Abstract]      
Segment profit   890 958
Other Segments [Member]      
Amounts Allocated To Segments [Abstract]      
Consolidated operating income (loss)   2 (13)
Amounts Not Allocated To Segments [Abstract]      
Segment profit   $ 2 $ (13)