CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Accounts Receivable, Allowance for Credit Loss, Current	$ 62	$ 76
Accounts Receivable, Allowance for Credit Loss, Noncurrent	$ 2	$ 5
Common stock, par value (in dollars per share)	$ 0.0000001
Common stock, shares authorized (in shares)	199,000,000
Common stock, shares issued (in shares)	114,000,000	113,000,000
Common stock, shares outstanding (in shares)	97,000,000	95,000,000
Treasury stock, at cost, shares held (in shares)	17,000,000