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Fair Value - Financial Instruments Carried at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Assets:    
Total $ 117 $ 166
Liabilities:    
Total 578 216
Derivatives    
Assets:    
Derivatives 2 58
Liabilities:    
Derivatives 578 216
Money market funds/mutual funds    
Assets:    
Money market funds/mutual funds 115 108
Level 1    
Assets:    
Total 115 108
Liabilities:    
Total 0 0
Level 1 | Derivatives    
Assets:    
Derivatives 0 0
Liabilities:    
Derivatives 0 0
Level 1 | Money market funds/mutual funds    
Assets:    
Money market funds/mutual funds 115 108
Level 2    
Assets:    
Total 2 58
Liabilities:    
Total 578 216
Level 2 | Derivatives    
Assets:    
Derivatives 2 58
Liabilities:    
Derivatives 578 216
Level 2 | Money market funds/mutual funds    
Assets:    
Money market funds/mutual funds $ 0 $ 0