Contracts with Customers Contracts with Customers (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Schedule of Contract Assets and Liabilities [Line Items]
Unbilled receivables, net	$ 8,620	$ 7,995
Contract with Customer, Asset, Explanation of Change	primarily driven by revenue recognized at BDS and BGS in excess of billings.
Advances and progress billings	$ 52,980	50,488
Contract with Customer, Liability, Explanation of Change	primarily driven by advances on orders received at BDS, BCA and BGS, partially offset by revenue recognized and the return of customer advances at BCA.
Contract with Customer, Liability, Revenue Recognized	$ 11,336	10,360
Commercial Customers
Schedule of Contract Assets and Liabilities [Line Items]
Unbilled receivables, expected to be collected after one year	$ 131	$ 178

[Line Items] for Schedule of Contract Assets and Claims [Table]

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- Definition

Explanation of change in right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

+ References

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-Publisher FASB
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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

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Explanation of change in obligation to transfer good or service to customer for which consideration from customer has been received or is due.

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Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

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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.

+ References

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Amount of receivables under long-term contracts that have not been billed and were not billable that are expected to be collected after the next fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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