Accounts Receivable - Schedule of Accounts Receivable (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Accounts receivable
Total accounts receivable	$ 339	$ 425
Other	36	37
Less: allowance for credit losses	(38)	(61)
Accounts receivable, less allowance	301	364
Earned and unbilled receivables
Accounts receivable
Total accounts receivable	35	63
Trade and purchased receivables
Accounts receivable
Total accounts receivable	$ 268	$ 325