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Related Party Agreements and Transactions (Intercompany Loans with Related Parties) (Detail) - Revolving Credit Facility - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Related Party Transaction [Line Items]      
Repayments of Related Party Debt $ 50 $ 0 $ 0
Proceeds from Related Party Debt 50 0 $ 0
Related Party      
Related Party Transaction [Line Items]      
Line of Credit Facility, Current Borrowing Capacity $ 1,500    
Debt Instrument, Description of Variable Rate Basis one-month term SOFR adjusted upward by 0.10 percent plus 1.25 percent    
Interest rate during period 5.68%    
Line of Credit, Current $ 0 $ 0