Cash Equivalents and Investments (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 2,384	$ 2,408
Short-term investments	64	566
Other assets	1,101	1,166
Certificates of deposit and money market deposit accounts/funds
Cash and Cash Equivalents [Line Items]
Cost	1,459	1,911
Gross Unrealized Gains	0	0
Fair Value	1,459	1,911
Cash and cash equivalents	1,393	1,345
Short-term investments	64	566
Other assets	2	0
Mutual funds
Cash and Cash Equivalents [Line Items]
Cost	95	88
Gross Unrealized Gains	13	10
Fair Value	108	98
Cash and cash equivalents	0	0
Short-term investments	0	0
Other assets	$ 108	$ 98