Liabilities, Commitments and Contingencies - Narrative (Details) $ in Millions	3 Months Ended					9 Months Ended		12 Months Ended
	Sep. 30, 2024 USD ($) lot aircraft	Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($) aircraft	Sep. 30, 2023 USD ($)	Sep. 30, 2018 USD ($) aircraft	Sep. 30, 2024 USD ($) lot aircraft	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2018 USD ($) aircraft simulator lot	Dec. 31, 2011 lot aircraft tanker
Commitments And Contingencies [Line Items]
Environmental loss contingency, operation and maintenance period, maximum						30 years
Loss contingency, range of possible loss, portion not accrued	$ 997					$ 997		$ 1,030
Contingent liabilities on outstanding letters of credit agreements and surety bonds	2,912					2,912		4,548
Supplier finance program, obligation	2,700					2,700		2,900
Increase to Loss from operations	(2,622)			$ (1,252)		(4,322)	$ (2,600)
Number of annual production lot | lot										13
2023
Commitments And Contingencies [Line Items]
Changes in estimates						171
VC-25B
Commitments And Contingencies [Line Items]
Contract value	$ 4,000					$ 4,000
Number of commercial aircraft | aircraft	2					2
Increase to Loss from operations		$ (250)						(482)
KC-46A Tanker
Commitments And Contingencies [Line Items]
Contract value	$ 27,000					$ 27,000
Increase to Loss from operations	$ (661)	(391)	$ (128)					(309)
Number of generation aerial refueling tanker | tanker										4
Number of aircraft | aircraft	139					139				179
Number of low rate initial production lot | lot	10					10
MQ-25
Commitments And Contingencies [Line Items]
Contract value					$ 890
Increase to Loss from operations	$ (217)				$ 291			(231)
Number of aircraft | aircraft					7
Cost-type contract modification, awarded amount			$ 657
Number of additional test aircraft | aircraft			2
T-7A EMD
Commitments And Contingencies [Line Items]
Contract value									$ 860
Number of aircraft | aircraft	4					4			5
Number of simulator | simulator									7
Services probable of being exercised, number of aircrafts | aircraft									346
T-7A Production
Commitments And Contingencies [Line Items]
Number of annual production lot | lot	4					4			11
T-7A EMD and Production
Commitments And Contingencies [Line Items]
Increase to Loss from operations	$ (908)	(278)	$ (94)					(275)
Commercial Crew
Commitments And Contingencies [Line Items]
Increase to Loss from operations	$ (250)	$ (125)						(288)
Minimum | Supplier Finance Program, Majority of Amounts Payable
Commitments And Contingencies [Line Items]
Supplier finance program, payment timing, period	30 days					30 days
Maximum
Commitments And Contingencies [Line Items]
Supplier finance program, payment timing, period	12 months					12 months
Maximum | Supplier Finance Program, Majority of Amounts Payable
Commitments And Contingencies [Line Items]
Supplier finance program, payment timing, period	90 days					90 days
Commercial Aircraft Commitments | Total Contractual Trade-In Commitment
Commitments And Contingencies [Line Items]
Other commitment	$ 1,325					$ 1,325		1,415
Commercial Aircraft Commitments | Net Amounts Payable to Customers Related to Probable Contractual Trade-In Commitments
Commitments And Contingencies [Line Items]
Other commitment	431					431		407
Commercial Aircraft Commitments | Fair Value of Trade in Value of Aircraft
Commitments And Contingencies [Line Items]
Other commitment	428					428		407
Financing Commitment
Commitments And Contingencies [Line Items]
Other commitment	17,379					17,379		$ 17,003
Financing Commitment | External Credit Rating, Non Investment Grade
Commitments And Contingencies [Line Items]
Other commitment	14,053					14,053
Joint Venture
Commitments And Contingencies [Line Items]
Other commitment	$ 261					$ 261
Other commitment, period	8 years					8 years
Contingent on Customer Negotiations
Commitments And Contingencies [Line Items]
737 MAX customer concessions and other considerations liability	$ 92					$ 92
Alaska Airlines 737-9 Accident and 737-9 Grounding
Commitments And Contingencies [Line Items]
Revenue from contract with customer, excluding assessed tax			$ 443
Capitalized Precontract Costs | KC-46A Tanker
Commitments And Contingencies [Line Items]
Capitalized precontract costs	137					137
Capitalized Precontract Costs | T-7A Production
Commitments And Contingencies [Line Items]
Capitalized precontract costs	285					285
Capitalized Precontract Costs | Commercial Crew
Commitments And Contingencies [Line Items]
Capitalized precontract costs	240					240
Potential Termination Liabilities | KC-46A Tanker
Commitments And Contingencies [Line Items]
Capitalized precontract costs	313					313
Potential Termination Liabilities | T-7A Production
Commitments And Contingencies [Line Items]
Capitalized precontract costs	594					594
Potential Termination Liabilities | Commercial Crew
Commitments And Contingencies [Line Items]
Capitalized precontract costs	$ 257					$ 257