Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net (loss)/earnings	$ (11,941)	$ (636)	$ 10,460
Currency translation adjustments	98	(27)	(86)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax of ($1), $1, and ($5)		1	2
Derivative instruments:
Unrealized gain/(loss) arising during period, net of tax of ($4), $13, and $40	14	(48)	(146)
Reclassification adjustment for loss included in net earnings, net of tax of ($7), ($7), and ($8)	27	26	30
Total unrealized gain/(loss) on derivative instruments, net of tax	41	(22)	(116)
Defined benefit pension plans & other postretirement benefits:
Net actuarial (loss)/gain arising during the period, net of tax of $111, $405, and ($105)	(1,956)	(1,413)	384
Amortization of actuarial losses included in net periodic pension cost, net of tax of ($52), ($133), and ($242)	917	464	878
Settlements and curtailments included in net income, net of tax of $0, $0, and ($2)	5		8
Pension and postretirement benefit related to our equity method investments, net of tax $0, ($5), and ($6)		17	22
Amortization of prior service credits included in net periodic pension cost, net of tax of $6, $25, and $39	(112)	(89)	(143)
Prior service cost/(credit) arising during the period, net of tax of ($2), $0, and ($94)	27	(1)	341
Total defined benefit pension plans & other postretirement benefits, net of tax	(1,119)	(1,022)	1,490
Other comprehensive (loss)/income, net of tax	(980)	(1,070)	1,290
Comprehensive loss related to noncontrolling interests	(68)	(41)	(21)
Comprehensive (loss)/income, net of tax	(12,921)	(1,747)	11,729
Comprehensive (loss)/income attributable to Boeing Shareholders, net of tax	(12,853)	(1,706)	11,750
Other Comprehensive Income (Loss), Tax [Abstract]
Unrealized gain on certain investments, tax	0	0	(1)
Unrealized loss arising during period, tax	(4)	13	40
Reclassification adjustment for loss/(gain) included in net earnings, tax	(7)	(7)	(8)
Net actuarial gain/(loss) arising during the period, tax	111	405	(105)
Amortization of actuarial losses included in net periodic pension cost, tax	(52)	(133)	(242)
Settlements and curtailments included in net income, tax	0	0	(2)
Pension and post retirement benefits related to our equity method investments, tax	0	(5)	(6)
Amortization of prior service cost included in net periodic pension cost, tax	6	25	39
Prior service cost arising during the period, tax	$ (2)	$ 0	$ (94)