Trade and other receivables, net (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Trade and other receivables
Total trade receivables	$ 311	$ 314
Orbital receivables, current portion	43	34
Other	4	3
Allowance for doubtful accounts	(1)	(1)
Total trade and other receivables, net	357	350
U.S government receivables
Trade and other receivables
Billed	88	96
Unbilled	46	60
Total trade receivables	134	156
Other governments and commercial receivables
Trade and other receivables
Billed	123	99
Unbilled	54	59
Total trade receivables	$ 177	$ 158

The amount of current portion of orbital receivables.

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- Definition

Amount, after allowance, receivable from customers, clients, or other third-parties, and receivables classified as other due within one year or the normal operating cycle, if longer.

+ References

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

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

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- Definition

Amount of allowance for credit loss on accounts receivable.

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- Definition

Amounts due for billed services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the Company and, at a minimum, one other party. An example would be amounts billed to customers under contracts or programs but not paid as of the balance sheet date.

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- Definition

Amount due from parties in nontrade transactions, classified as other.

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Unbilled amounts due for services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the entity and, at a minimum, one other party. An example would be amounts associated with contracts or programs where the recognized revenue for performance thereunder exceeds the amounts billed under the terms thereof as of the date of the balance sheet.

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