Condensed Consolidated Statements Of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net loss	$ (132)	$ (466)	$ (126)	$ (3,502)
Currency translation adjustments	(41)	48	(63)	15
Unrealized (loss)/gain on derivative instruments [Abstract]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax	(1)	79	64	(107)
Unrealized loss arising during period, tax	(1)	(23)	(18)	31
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax	4	(8)	6	(20)
Reclassification adjustment for losses included in net earnings, tax	2	(2)	2	(6)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax	(5)	87	58	(87)
Defined benefit pension plans & other postretirement benefits [Abstract]
Prior service credit arising during the period, net of tax of $0, ($4), $0 and ($4)		13		13
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Tax	0	(4)	0	(4)
Amortization of prior service credits included in net periodic pension cost, net of tax of $18, $22, $6 and $10	(23)	(22)	(68)	(67)
Amortization of prior service cost included in net periodic pension cost, tax	6	10	18	22
Net actuarial gain/(loss) arising during the period, net of tax of ($106), $19, ($104) and $16	1,544	(53)	1,551	(65)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax	(104)	16	(106)	19
Amortization of actuarial losses included in net periodic pension cost, net of tax of ($182), ($179), ($60) and ($76)	227	172	690	562
Amortization of actuarial losses included in net periodic pension cost, tax	(60)	(76)	(182)	(179)
Settlements included in net loss, net of tax of ($11), ($1), ($10) and $0	142	1	145	3
Other Comprehensive Income, Settlements and curtailments included in net income, tax	(10)	0	(11)	(1)
Pension and postretirement cost related to our equity method investments, net of tax of ($1), $0, $0 and $0	(1)		2
Pension and post retirement benefits related to our equity method investments, tax	0	0	(1)	0
Total defined benefit pension plans and other postretirement benefits, net of tax	1,889	111	2,320	446
Other comprehensive income, net of tax	1,843	246	2,315	374
Comprehensive income/(loss), net of tax	1,711	(220)	2,189	(3,128)
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	(23)	(17)	(67)	(49)
Comprehensive income/(loss) attributable to Boeing Shareholders, net of tax	$ 1,734	$ (203)	$ 2,256	$ (3,079)