Liabilities, Commitments and Contingencies - Narrative (Details) $ in Millions	3 Months Ended			12 Months Ended
	Mar. 31, 2025 USD ($) lot aircraft	Mar. 31, 2024 USD ($) aircraft	Sep. 30, 2018 USD ($) aircraft	Dec. 31, 2024 USD ($)	Dec. 31, 2018 USD ($) simulator aircraft	Dec. 31, 2011 aircraft tanker lot
Commitments And Contingencies [Line Items]
Environmental loss contingency, operation and maintenance period, maximum	30 years
Loss contingency, range of possible loss, portion not accrued	$ 996			$ 1,002
Contingent liabilities on outstanding letters of credit agreements and surety bonds	3,036			2,991
Supplier finance program, obligation	2,107			2,703
Capital Investment, Amount	500
Increase (decrease) in earnings from operations due to change in accounting estimate	(151)	$ (366)
Number of annual production lot | lot						13
VC-25B
Commitments And Contingencies [Line Items]
Contract value	$ 4,000
Number of commercial aircraft | aircraft	2
Increase (decrease) in earnings from operations due to change in accounting estimate				(379)
KC-46A Tanker
Commitments And Contingencies [Line Items]
Contract value	$ 29,000
Increase (decrease) in earnings from operations due to change in accounting estimate				(2,002)
Number of generation aerial refueling tanker | tanker						4
Number of aircraft | aircraft	154					179
Number of low rate initial production lot | lot	11
MQ-25
Commitments And Contingencies [Line Items]
Contract value			$ 890
Increase (decrease) in earnings from operations due to change in accounting estimate			$ (291)	(339)
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	5				5
Number of simulator | simulator					7
T-7A EMD and Production
Commitments And Contingencies [Line Items]
Increase (decrease) in earnings from operations due to change in accounting estimate				(1,770)
T-7A Production
Commitments And Contingencies [Line Items]
Number of annual production lot | lot	4
Commercial Crew
Commitments And Contingencies [Line Items]
Increase (decrease) in earnings from operations due to change in accounting estimate				(523)
Minimum | Supplier Finance Program, Majority of Amounts Payable
Commitments And Contingencies [Line Items]
Supplier finance program, payment timing, period	30 days
Maximum
Commitments And Contingencies [Line Items]
Supplier finance program, payment timing, period	12 months
Maximum | Supplier Finance Program, Majority of Amounts Payable
Commitments And Contingencies [Line Items]
Supplier finance program, payment timing, period	90 days
Commercial Aircraft Commitments | Total Contractual Trade-In Commitment
Commitments And Contingencies [Line Items]
Other commitment	$ 1,512			1,393
Commercial Aircraft Commitments | Net Amounts Payable to Customers Related to Probable Contractual Trade-In Commitments
Commitments And Contingencies [Line Items]
Other commitment	71			275
Commercial Aircraft Commitments | Fair Value of Trade in Value of Aircraft
Commitments And Contingencies [Line Items]
Other commitment	67			270
Financing Commitment
Commitments And Contingencies [Line Items]
Other commitment	17,157			$ 17,124
Financing Commitment | External Credit Rating, Non Investment Grade
Commitments And Contingencies [Line Items]
Other commitment	13,832
Joint Venture
Commitments And Contingencies [Line Items]
Other commitment	$ 277
Other commitment, period	8 years
2023
Commitments And Contingencies [Line Items]
Changes in estimates	$ 109
Contingent on Customer Negotiations
Commitments And Contingencies [Line Items]
737 MAX customer concessions and other considerations liability	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	107
Capitalized Precontract Costs | T-7A Production
Commitments And Contingencies [Line Items]
Capitalized precontract costs	361
Capitalized Precontract Costs | Commercial Crew
Commitments And Contingencies [Line Items]
Capitalized precontract costs	401
Potential Termination Liabilities | KC-46A Tanker
Commitments And Contingencies [Line Items]
Capitalized precontract costs	183
Potential Termination Liabilities | T-7A Production
Commitments And Contingencies [Line Items]
Capitalized precontract costs	783
Potential Termination Liabilities | Commercial Crew
Commitments And Contingencies [Line Items]
Capitalized precontract costs	$ 147