CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (PARENTHETICAL) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 25	$ 17
Accumulated depreciation	$ 2,141	$ 2,072
Common stock, par value (in dollars per share)	$ 0.01
Common stock, shares authorized	6,000,000,000
Common stock issued, shares	501,891,243	501,891,243
Common stock, shares outstanding	471,208,803	472,574,090
Treasury stock, shares	30,682,440	29,317,153
Restricted cash	$ 3	$ 3