For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
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-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

Name:	us-gaap_ConcentrationRiskPercentage1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Trade and other receivables, net - Orbital receivables (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) customer	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Trade and other receivables
Orbital receivables	$ 382	$ 407
Impairment to long-term orbital receivables	$ 14	$ 22	$ 0
Accounts Receivable \| Credit Concentration Risk
Trade and other receivables
Number of customers \| customer	14
Accounts Receivable \| Credit Concentration Risk \| Largest Customer
Trade and other receivables
Concentration risk, percentage	27.00%
Minimum
Trade and other receivables
Discount rate for recognition of revenue on percentage completion basis	6.00%	6.00%
Maximum
Trade and other receivables
Discount rate for recognition of revenue on percentage completion basis	10.00%	10.00%