Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Statement of Comprehensive Income [Abstract]
Net loss	$ (5,339)	$ (6,174)	$ (5,982)	$ (7,968)
Other comprehensive income/(loss), net of tax:
Currency translation adjustments	(1)	54	107	30
Unrealized gain on certain investments, net of tax of $0, $0, $0 and $0		1		1
Derivative instruments:
Unrealized gains/(losses) arising during period, net of tax of ($52), $3, $7 and ($19)	(25)	63	181	(13)
Reclassification adjustment for losses included in net loss, net of tax of ($9), ($7), ($1) and $1	4		32	26
Total unrealized gain/(loss) on derivative instruments, net of tax	(21)	63	213	13
Defined benefit pension plans and other postretirement benefits:
Net actuarial loss arising during the period, net of tax of $0, $16, $0 and ($1)			(2)	(18)
Amortization of actuarial losses included in net periodic benefit cost, net of tax of ($26), ($30), ($9) and ($10)	32	12	97	38
Amortization of prior service credits included in net periodic benefit cost, net of tax of $12, $31,$4 and $11	(15)	(12)	(44)	(38)
Pension and postretirement cost related to our equity method investments, net of tax of $0, ($2), $0 and $1		1		6
Total defined benefit pension plans and other postretirement benefits, net of tax	17	1	51	(12)
Other comprehensive income/(loss), net of tax	(5)	119	371	32
Comprehensive loss	(5,344)	(6,055)	(5,611)	(7,936)
Less: Comprehensive income/(loss) related to noncontrolling interest	(2)	(4)	3	(16)
Comprehensive loss attributable to Boeing Shareholders	$ (5,342)	$ (6,051)	$ (5,614)	$ (7,920)