UNAUDITED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Accounts receivable, allowance for expected credit losses	$ 102	$ 101
Prepaid expenses, allowance for expected credit losses, current	23	29
Other assets, allowance for expected credit losses, noncurrent	$ 20	$ 18
Common stock, par value (in dollars per share)	$ 0.008	$ 0.008
Common stock, shares authorized (in shares)	1,000,000,000	1,000,000,000
Common stock, shares issued (in shares)	63,759,178	63,584,444
Treasury stock, shares (in shares)	23,004,503	22,518,391