Contracts with Customers Contracts with Customers (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Schedule of Contract Assets and Claims [Line Items]
Unbilled receivables, expected to be collected after one year	$ 2,847	$ 3,045
Unbilled receivables, net	$ 10,025	8,194
Contract with Customer, Asset, Explanation of Change	primarily driven by revenue recognized at BDS, BGS and BCA in excess of billings.
Advances and progress billings	$ 50,676	48,042
Contract with Customer, Liability, Explanation of Change	primarily driven by advances on orders received in excess of revenue recognized at BCA
Contract with Customer, Liability, Revenue Recognized	$ 24,737	22,796
Commercial Customers [Member]
Schedule of Contract Assets and Claims [Line Items]
Unbilled receivables, expected to be collected after one year	$ 150	$ 172

[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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 10
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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

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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.

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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

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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

No definition available.

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