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The number of performance obligations.

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The term of the service contract.

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The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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Significant accounting policies - Narratives (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Investments
Impairment of investments	$ 0
Foreign exchange forward contracts
Derivative financial instruments and hedging activities
Assets	5,000,000	$ 13,000,000
Liabilities	8,000,000	9,000,000
Derivative asset, subject to master netting	3,000,000	7,000,000
Selling, general and administrative
Research and development
Research and development costs	93,000,000	$ 71,000,000	$ 69,000,000
Imagery \| EnhancedView contract
Revenue recognition
Number of performance obligations	$ 1
Contractual term	10 years
Period of option	3 years
Imagery \| Direct Access Program
Revenue recognition
Number of performance obligations	$ 2