Business combination - Intangible assets of DigitalGlobe (Details) - DigitalGlobe $ in Millions	12 Months Ended
Dec. 31, 2018 USD ($)
Intangible assets
Carrying Value	$ 1,440
Customer relationships
Intangible assets
Carrying Value	$ 608
Weighted average useful life (in years)	14 years
Backlog
Intangible assets
Carrying Value	$ 331
Weighted average useful life (in years)	4 years
Technologies
Intangible assets
Carrying Value	$ 318
Weighted average useful life (in years)	5 years
Software
Intangible assets
Carrying Value	$ 46
Weighted average useful life (in years)	3 years
Image library
Intangible assets
Carrying Value	$ 80
Weighted average useful life (in years)	5 years
Trade names and trademarks
Intangible assets
Carrying Value	$ 37
Weighted average useful life (in years)	10 years
Other
Intangible assets
Carrying Value	$ 20
Weighted average useful life (in years)	2 years

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No definition available.

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Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
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Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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