Cash Equivalents and Investments (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Cash and Cash Equivalents [Line Items]
Fair Value	$ 64	$ 73
Cash and cash equivalents	1,750	1,811
Short-term investments	103	91
Other assets	1,061	1,034
Certificates of deposit and money market deposit accounts
Cash and Cash Equivalents [Line Items]
Cost	694	691
Gains/(Losses)	0	0
Fair Value	694	691
Cash and cash equivalents	582	584
Short-term investments	103	91
Other assets	9	16
Mutual funds
Cash and Cash Equivalents [Line Items]
Cost	62	65
Gains/(Losses)	2	8
Fair Value	64	73
Cash and cash equivalents	0	0
Short-term investments	0	0
Other assets	$ 64	$ 73