Customer Financing (Scheduled Receipts On Customer Financing) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Sales-type/finance lease payments receivable [Abstract]
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, Next Rolling Twelve Months	$ 164
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, Rolling Year Two	150
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, Rolling Year Three	141
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, Rolling Year Four	121
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, Rolling Year Five	83
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, after Rolling Year Five	97
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received	756
Sales-type, Direct Financing Leases, Residual Value of Leased Asset	136
Sales-type and Direct Financing Leases, Lease Receivable, Undiscounted Excess Amount	299	$ 393
Investment in sales-type/finance leases	919
Payments on notes receivable [Abstract]
Notes Receivable, Future Payments Receivable, Next Rolling Twelve Months	149
Notes Receivable, Future Payments Receivable, Due in Rolling Year Two	53
Notes Receivable, Future Payments Receivable, Due in Rolling Year Three	34
Notes Receivable, Future Payments Receivable, Due in Rolling Year Four	18
Notes Receivable, Future Payments Receivable, Due in Rolling Year Five	19
Notes Receivable, Future Payments Receivable, Due in Rolling after Year Five	147
Notes Receivable Future Payments Receivable	420
Operating lease equipment payments receivable [Abstract]
Lessor, Operating Lease, Payments to be Received, Next Rolling Twelve Months	85
Lessor, Operating Lease, Payments to be Received, Rolling Year Two	75
Lessor, Operating Lease, Payments to be Received, Rolling Year Three	72
Lessor, Operating Lease, Payments to be Received, Rolling Year Four	56
Lessor, Operating Lease, Payments to be Received, Rolling Year Five	34
Lessor, Operating Lease, Payments to be Received, after Rolling Year Five	66
Lessor, Operating Lease, Payments to be Received	$ 388

Notes Receivable Future Payments Receivable

No definition available.

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

- Definition

Amount of minimum lease payments to be received by the lessor in the sixth rolling twelve months following the latest balance sheet presented for notes receivable.

+ References

No definition available.

+ Details

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

- Definition

Amount of payments to be received by the lessor in the fifth rolling twelve months following the latest balance sheet presented for notes receivable.

+ References

No definition available.

+ Details

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

- Definition

Amount of payments to be received by the lessor in the fourth rolling twelve months following the latest balance sheet presented for notes receivable.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of payments to be received by the lessor in the third rolling twelve months following the latest balance sheet presented for notes receivable.

+ References

No definition available.

+ Details

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

- Definition

Amount of payments to be received by the lessor in the second rolling twelve months following the latest balance sheet presented for notes receivable.

+ References

No definition available.

+ Details

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

- Definition

Amount of payments to be received by the lessor in the next rolling twelve months following the latest balance sheet presented for notes receivable.

+ References

No definition available.

+ Details

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Namespace Prefix:	ba_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

-None. No documentation exists for this element.-

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of residual asset covered by residual value guarantee under sales-type and direct financing leases. Excludes guarantee considered to be lease payments for lessor.

+ References

No definition available.

+ Details

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

- References

No definition available.

+ Details

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

- Definition

Amount of lease payments to be received by lessor for operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=121576215&loc=SL77919396-209981

+ Details

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

- Definition

Amount of lease payments to be received by lessor in period after fifth rolling twelve months following latest statement of financial position date for operating lease. For interim and annual periods when interim periods are reported on rolling approach, from latest statement of financial position date.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=121576215&loc=SL77919396-209981

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

- Definition

Amount of lease payments to be received by lessor in next rolling twelve months following latest statement of financial position date for operating lease. For interim and annual periods when interim periods are reported on rolling approach, from latest statement of financial position date.

+ References

+ Details

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- Definition

Amount of lease payments to be received by lessor in fifth rolling twelve months following latest statement of financial position date for operating lease. For interim and annual periods when interim periods are reported on rolling approach, from latest statement of financial position date.

+ References

+ Details

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- Definition

Amount of lease payments to be received by lessor in fourth rolling twelve months following latest statement of financial position date for operating lease. For interim and annual periods when interim periods are reported on rolling approach, from latest statement of financial position date.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of lease payments to be received by lessor in third rolling twelve months following latest statement of financial position date for operating lease. For interim and annual periods when interim periods are reported on rolling approach, from latest statement of financial position date.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- Definition

Amount of lease payments to be received by lessor in second rolling twelve months following latest statement of financial position date for operating lease. For interim and annual periods when interim periods are reported on rolling approach, from latest statement of financial position date.

+ References

+ Details

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

- References

No definition available.

+ Details

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

- Definition

Present value of lease payments not yet received by lessor and amount expected to be derived from underlying asset, following end of lease term guaranteed by lessee or other third party unrelated to lessor, from sales-type and direct financing leases.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=121576215&loc=SL77919391-209981

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=121576215&loc=SL77919379-209981

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

- Definition

Amount of undiscounted cash flows to be received by lessor for sales-type and direct financing leases after fifth rolling twelve months following latest statement of financial position date. For interim and annual periods when interim periods are reported on rolling approach, from latest statement of financial position date.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=121576215&loc=SL77919391-209981

+ Details

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Balance Type:	debit
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- Definition

Amount of undiscounted cash flows to be received by lessor for sales-type and direct financing leases in fifth rolling twelve months following latest statement of financial position date. For interim and annual periods when interim periods are reported on rolling approach, from latest statement of financial position date.

+ References

+ Details

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- Definition

Amount of undiscounted cash flows to be received by lessor for sales-type and direct financing leases in third rolling twelve months following latest statement of financial position date. For interim and annual periods when interim periods are reported on rolling approach, from latest statement of financial position date.

+ References

+ Details

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- Definition

Amount of undiscounted cash flows to be received by lessor for sales-type and direct financing leases in second rolling twelve months following latest statement of financial position date. For interim and annual periods when interim periods are reported on rolling approach, from latest statement of financial position date.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

Amount of undiscounted cash flows to be received by lessor for sales-type and direct financing leases.

+ References

+ Details

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- Definition

Amount of undiscounted cash flows to be received by lessor for sales-type and direct financing leases in next rolling twelve months following latest statement of financial position date. For interim and annual periods when interim periods are reported on rolling approach, from latest statement of financial position date.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

Amount of undiscounted cash flows to be received by lessor for sales-type and direct financing leases in fourth rolling twelve months following latest statement of financial position date. For interim and annual periods when interim periods are reported on rolling approach, from latest statement of financial position date.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

Amount of undiscounted lease receivable in excess of discounted receivable for sales-type and direct financing leases.

+ References

+ Details

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