Related-party Transactions - Schedule of Amounts Related to Receivable and Payable Balances with Related Parties (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Related Party Transactions [Abstract]
Receivables	$ 3	$ 21
Payables	$ 7	$ 9

For an unclassified balance sheet, amount of receivables arising from transactions with related parties.

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Name:	us-gaap_AccountsReceivableRelatedParties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant