Trade and other receivables, net (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Trade and other receivables
Total trade receivables	$ 276	$ 311
Orbital receivables, current portion	49	43
Other	3	4
Allowance for doubtful accounts	(1)	(1)
Total trade and other receivables, net	327	357
U.S government receivables
Trade and other receivables
Billed	84	88
Unbilled	76	46
Total trade receivables	160	134
Other governments and commercial receivables
Trade and other receivables
Billed	97	123
Unbilled	19	54
Total trade receivables	$ 116	$ 177

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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