Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Allowance for doubtful accounts receivable	$ 2	$ 3
Total assets	9,794	10,587
Total liabilities	$ 5,326	$ 5,744
Common stock, par value (per share)	$ 0.01	$ 0.01
Common stock, authorized shares	6,000,000,000	6,000,000,000
Common stock, issued shares	236,884,447	236,217,344
Common stock, outstanding shares	236,479,696	235,915,749
Consolidated VIEs [Member]
Total assets	$ 239	$ 229
Total liabilities	$ 218	$ 213