RELATED PARTY TRANSACTIONS - Schedule of Financial Data Resulting from Transactions with Related Parties, Income Statement Data (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Related Party Transaction [Line Items]
Cost reimbursement revenue		$ 26,186	$ 25,100	$ 23,713
Equity in earnings	[1]	11	8	9
Equity Method Investment
Related Party Transaction [Line Items]
Equity in earnings		11	8	9
Reimbursements
Related Party Transaction [Line Items]
Cost reimbursement revenue	[1]	19,204	18,482	17,413
Reimbursed expenses	[1]	(19,503)	(18,799)	(17,424)
Reimbursements | Equity Method Investment
Related Party Transaction [Line Items]
Cost reimbursement revenue		133	131	122
Reimbursed expenses		$ (138)	$ (135)	$ (126)

[1] See Note 15 for disclosure of related party amounts.