Cash Equivalents and Investments (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 2,476	$ 2,130
Short-term investments	58	63
Other assets	1,170	1,138
Certificates of deposit and money market deposit accounts/funds
Cash and Cash Equivalents [Line Items]
Cost	1,360	1,178
Gains/(Losses)	0	0
Fair Value	1,360	1,178
Cash and cash equivalents	1,297	1,112
Short-term investments	58	63
Other assets	5	3
Mutual funds
Cash and Cash Equivalents [Line Items]
Cost	96	91
Gains/(Losses)	9	6
Fair Value	105	97
Cash and cash equivalents	0	0
Short-term investments	0	0
Other assets	$ 105	$ 97