v3.26.1
Changes in Accumulated Other Comprehensive Loss by Component - Schedule of Reclassifications Out of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
(Loss) earnings before income taxes $ (35) $ (125) $ (203) $ (116)
Tax benefit (expense) (21) 49 (21) 46
Net loss (56) (76) (224) (70)
Reclassification Out of Accumulated Other Comprehensive (Loss) Income | Net derivative (losses) gains on cash flow hedges        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
(Loss) earnings before income taxes (1) (2) 8 (12)
Tax benefit (expense) 0 1 (2) 3
Net loss (1) (1) 6 (9)
Reclassification Out of Accumulated Other Comprehensive (Loss) Income | Net derivative (losses) gains on cash flow hedges | Natural Gas Swap Contracts        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Cost of Sales [1]     1 2
Reclassification Out of Accumulated Other Comprehensive (Loss) Income | Net derivative (losses) gains on cash flow hedges | Currency Options and Forwards        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Cost of Sales [1] (1) $ (2) 7 (14)
Reclassification Out of Accumulated Other Comprehensive (Loss) Income | Other Post-Retirement Benefit Plans | Accumulated Defined Benefit Plans Adjustment        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Amortization of net actuarial gain [2] 1   1 1
(Loss) earnings before income taxes 1   1 1
Net loss 1   1 1
Reclassification Out of Accumulated Other Comprehensive (Loss) Income | Pension Plans | Accumulated Defined Benefit Plans Adjustment        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Amortization of net actuarial gain [2]       (1)
Settlement loss [2] (7)   (7)  
(Loss) earnings before income taxes (7)   (7) (1)
Tax benefit (expense) 1   1 $ 1
Net loss $ (6)   $ (6)  
[1] These amounts are included in Cost of sales in the Consolidated Statements of Earnings (Loss) and Comprehensive Income (Loss).
[2] These amounts are included in the computation of net periodic benefit cost (see Note 5 “Pension plans and other post-retirement benefit plans” for more details).