Accounts Receivable - Schedule in Accounts Receivable (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other receivables	$ 62	$ 91
Total accounts receivable	1,658	2,153
Less: allowance for credit losses	(114)	(191)
Accounts receivable, less allowance	1,544	1,962
Earned and unbilled receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	315	345
Trade and purchased receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total accounts receivable	$ 1,281	$ 1,717