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Cash Equivalents and Investments (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2025	Dec. 31, 2023	Dec. 31, 2024
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 2,139		$ 2,408
Short-term investments	62		566
Other assets	1,136		1,166
Certificates of deposit and money market deposit accounts/funds
Cash and Cash Equivalents [Line Items]
Cost	1,123		1,911
Gains/(Losses)	0	$ 0
Fair Value	1,123		1,911
Cash and cash equivalents	1,054		1,345
Short-term investments	62		566
Other assets	7		0
Mutual funds
Cash and Cash Equivalents [Line Items]
Cost	87		88
Gains/(Losses)	11	$ 10
Fair Value	98		98
Cash and cash equivalents	0		0
Short-term investments	0		0
Other assets	$ 98		$ 98

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Cost of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Excludes equity method investment and investment in equity security without readily determinable fair value.

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