Accounts Receivable - Schedule of Accounts Receivable (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	$ 681	$ 728
Other receivables	2	0
Less: allowance for credit losses	(39)	(45)
Accounts receivable, less allowance	642	683
Trade receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	495	570
Earned and unbilled receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	$ 184	$ 158