Cash Equivalents and Investments (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Cash and Cash Equivalents [Line Items]
Fair Value	$ 73	$ 60
Cash and cash equivalents	1,811	2,597
Short-term investments	91	99
Certificates of deposit and money market deposit accounts
Cash and Cash Equivalents [Line Items]
Cost	691	1,430
Gross Unrealized Gains	0	0
Fair Value	691	1,430
Cash and cash equivalents	584	1,325
Short-term investments	91	99
Other assets	16	6
Mutual funds
Cash and Cash Equivalents [Line Items]
Cost	65	54
Gross Unrealized Gains	8	6
Fair Value	73	60
Cash and cash equivalents	0	0
Short-term investments	0	0
Other assets	$ 73	$ 60