Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Statement of Comprehensive Income [Abstract]
Net loss	$ (7)	$ (31)
Other comprehensive income, net of tax:
Currency translation adjustments	(63)	46
Unrealized loss on certain investments, net of tax of $0 and $0	(1)
Derivative instruments:
Unrealized (loss)/gain arising during period, net of tax of $6 and ($20)	(8)	68
Reclassification adjustment for (gain)/loss included in net loss, net of tax of $4 and ($5)	(6)	18
Total unrealized (loss)/gain on derivative instruments, net of tax	(14)	86
Defined benefit pension plans and other postretirement benefits:
Net actuarial gain arising during the period, net of tax of ($2) and $0	9
Amortization of actuarial loss included in net periodic benefit cost, net of tax of ($25) and $3	95	43
Amortization of prior service credits included in net periodic benefit cost, net of tax of $4 and ($1)	(15)	(20)
Total defined benefit pension plans and other postretirement benefits, net of tax	89	23
Other comprehensive income, net of tax	11	155
Comprehensive income	4	124
Less: Comprehensive (loss)/income related to noncontrolling interest	(3)	6
Comprehensive income attributable to Boeing Shareholders	$ 7	$ 118