Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Accounts receivable, net of allowances	$ 12	$ 12
Property and equipment, net of accumulated depreciation	$ 670	$ 1,041
Preferred stock, shares authorized (in shares)	1,000,000,000	1,000,000,000
Preferred stock, shares issued (in shares)	0	0
Common stock, shares authorized (in shares)	5,000,000,000	5,000,000,000
Common stock, shares issued (in shares)	474,091,024	473,119,786
Common stock, shares outstanding (in shares)	474,091,024	473,119,786