v3.25.4
Employee Benefit Plans - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of defined benefit plans [line items]    
Post-employment benefit expense, defined contribution plans $ 102,000,000 $ 92,000,000
Gain from plan amendments   13,000,000
Securities held $ 0 $ 0
Average Plan [Member]    
Disclosure of defined benefit plans [line items]    
Retirement age used to for life expectancy 65 years 65 years
Participant Plan [Member]    
Disclosure of defined benefit plans [line items]    
Current age of participants to determine life expectancy at retirement 40 years 40 years
Retiring Plan [Member]    
Disclosure of defined benefit plans [line items]    
Years to retirement difference between current age of participants and retirement age 25 years 25 years
TRGP and TTC Plans [Member]    
Disclosure of defined benefit plans [line items]    
Increase in life expectancy 1 year  
TRGP and TTC Plans [Member] | Discount Rate [Member]    
Disclosure of defined benefit plans [line items]    
Percentage of reasonably possible change in actuarial assumption 0.25%  
TRGP and TTC Plans [Member] | Rates of Inflation [Member]    
Disclosure of defined benefit plans [line items]    
Percentage of reasonably possible change in actuarial assumption 0.25%  
Discount Rate Sensitivity [Member]    
Disclosure of defined benefit plans [line items]    
Change in defined benefit obligation due to reasonably possible change in actuarial assumption $ 65,000,000  
Life Expectancy Sensitivity [Member]    
Disclosure of defined benefit plans [line items]    
Change in defined benefit obligation due to reasonably possible change in actuarial assumption 53,000,000  
Material Defined Benefit Plans [Member]    
Disclosure of defined benefit plans [line items]    
Employer contribution to defined benefit plans 32,000,000 $ 35,000,000
Expected employer contribution to be made in 2020 33,000,000  
Funded Plans [Member]    
Disclosure of defined benefit plans [line items]    
Expected employer contribution to be made in 2020 7,000,000  
OPEB [Member]    
Disclosure of defined benefit plans [line items]    
Expected employer contribution to be made in 2020 $ 26,000,000  
Bottom of Range [Member]    
Disclosure of defined benefit plans [line items]    
Normal retirement age 60 years  
Top of Range [Member]    
Disclosure of defined benefit plans [line items]    
Normal retirement age 65 years