Arrangements With Off-Balance Sheet Risk (Third Party Guarantees) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Contingent Repurchase Commitments
Guarantor Obligations [Line Items]
Maximum Potential Payments	$ 548	$ 1,452
Estimated Proceeds from Collateral or Recourse	548	1,452
Carrying Amount of Liabilities
Credit Guarantee
Guarantor Obligations [Line Items]
Maximum Potential Payments	90	90
Estimated Proceeds from Collateral or Recourse	28	28
Carrying Amount of Liabilities	$ 24	$ 24

Indicates, if estimable, the approximate extent to which recourse provisions or proceeds from liquidation of any assets held either as collateral or by third parties would be expected to cover the maximum potential amount of future payments under the guarantee (or each group of similar guarantees).

No definition available.

+ Details

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Namespace Prefix:	ba_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=124440162&loc=d3e12069-110248

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=124440162&loc=d3e12069-110248

+ Details

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Balance Type:	credit
Period Type:	instant

- Details

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Namespace Prefix:
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Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
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