Income Taxes - Narrative (Details) - USD ($) $ in Millions		12 Months Ended
	Dec. 08, 2025	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Effective Income Tax Rate Reconciliation [Line Items]
Total net income tax payments		$ 275	$ 187	$ 204
Deferred tax assets		21,065	17,991
Deferred tax liabilities		(11,420)	(10,091)
Valuation allowance		(9,754)	(7,837)
Valuation allowance, deferred tax asset, increase (decrease), amount		1,917
Unrecognized tax benefits that would affect the effective tax rate, if recognized		$ 975	$ 651	$ 1,088
Spirit AeroSystems Holdings, Inc.
Effective Income Tax Rate Reconciliation [Line Items]
Business combination, valuation allowance, deferred tax asset, effect on income tax expense, increase (decrease)	$ 1,833