Other Financial Data - Summary of Components of Receivables, Net (Details) - USD ($) $ in Millions	Sep. 30, 2021	Jul. 01, 2021	Dec. 31, 2020
Other Financial Data [Abstract]
Billed and unbilled receivables	$ 509		$ 547
Allowance for expected credit losses	(4)	$ 0	(15)
Balance at end of period	$ 505		$ 532

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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Name:	us-gaap_AccountsReceivableNetCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant