CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Accounts receivable, allowance	$ 66	$ 65
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, authorized shares (in shares)	1,600,000,000	1,600,000,000
Common stock, shares issued (in shares)	276,329,000	274,661,000
Common stock, shares outstanding (in shares)	151,554,000	150,125,000
Treasury stock (in shares)	132,051,000	131,813,000
Class B Common Stock
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, authorized shares (in shares)	400,000,000	400,000,000
Common stock, shares issued (in shares)	12,800,000	12,800,000
Common stock, shares outstanding (in shares)	5,523,000	5,523,000
Treasury stock (in shares)	7,300,000	7,300,000