v3.26.1
Borrowings - Additional Information (Detail)
£ in Millions
3 Months Ended
Mar. 31, 2026
USD ($)
Mar. 31, 2026
GBP (£)
Dec. 31, 2025
USD ($)
Debt Instrument [Line Items]      
Line of credit facility, covenant terms The 2026 Credit Facility requires the Company not to exceed a maximum consolidated leverage ratio (ratio of net debt to earnings before interest, taxes, depreciation and amortization, where net debt equals total debt less unrestricted cash) of 3.5 to 1    
Borrowings $ 12,749,000,000   $ 12,768,000,000
Fair Value 12,318,000,000   $ 12,500,000,000
Aggregate principal amount 12,853,000,000    
Minimum [Member]      
Debt Instrument [Line Items]      
Unsecured revolving credit facility 400,000,000    
Maximum [Member]      
Debt Instrument [Line Items]      
Unsecured revolving credit facility 6,300,000,000    
Commercial Paper [Member]      
Debt Instrument [Line Items]      
Maximum amount available under facility 5,000,000,000    
Amount outstanding under credit facility 0    
2026 Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Additional amount available, subject to lender credit approval 1,400,000,000    
Maximum amount available under facility 7,700,000,000    
Amount outstanding under credit facility $ 0    
Line of credit facility, covenant compliance less than 1 to 1    
Maximum leverage ratio required by credit facility 3.5 to 1    
2026 Subsidiary Credit Facility [Member] | Subsidiaries [Member]      
Debt Instrument [Line Items]      
Maximum amount available under facility $ 33,000,000 £ 25  
Aggregate principal amount $ 0