Contracts with Customers Contracts with Customers (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Schedule of Contract Assets and Claims [Line Items]
Unbilled receivables, net	$ 9,043	$ 10,025
Contract with Customer, Asset, Explanation of Change	primarily driven by timing of billings at BDS and BGS.
Advances and progress billings	$ 51,551	50,676
Contract with Customer, Liability, Explanation of Change	primarily driven by advances on orders received in excess of revenue recognized at BDS, BGS, and BCA
Contract with Customer, Liability, Revenue Recognized	$ 16,778	24,737
Unbilled receivables, expected to be collected after one year	2,112	2,847
Commercial Customers [Member]
Schedule of Contract Assets and Claims [Line Items]
Unbilled receivables, expected to be collected after one year	$ 211	$ 150

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

No definition available.

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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130551-203045

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
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-URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130531-203044

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

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

+ References

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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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- Definition

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-SubTopic 310
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- Definition

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

No definition available.

+ Details

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