Postretirement Plans - Schedule of Allocation of Plan Assets (Details) - Pension - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Estimate of Fair Value Measurement
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	$ 32,753	$ 46,193
Defined benefit plan, plan assets, amount	49,825	67,813	$ 68,696
Defined benefit plan, plan assets measured at net asset value	16,255	20,789
Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	7,054	10,851
Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	25,431	35,144
Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	268	198	240
Cash equivalents and other short-term investments
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	571	448
Cash equivalents and other short-term investments | Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	571	448
Real estate and real assets
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at net asset value	3,525	3,952
Private equity
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at net asset value	4,239	5,100
Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at net asset value	3,391	4,717
Cash
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	409	520
Receivables
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	541	454
Payables
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	(133)	(143)
Corporate | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	15,095	20,573
Corporate | Fixed income | Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	15,025	20,520
Corporate | Fixed income | Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	70	53	40
U.S. government and agencies | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	7,827	11,285
U.S. government and agencies | Fixed income | Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	7,827	11,285
U.S. government and agencies | Fixed income | Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount			2
Mortgage backed and asset backed | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	664	777
Mortgage backed and asset backed | Fixed income | Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	502	675
Mortgage backed and asset backed | Fixed income | Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	162	102	120
Municipal | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	843	1,064
Municipal | Fixed income | Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	811	1,035
Municipal | Fixed income | Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	32	29	72
Sovereign | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	706	1,135
Sovereign | Fixed income | Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	706	1,126
Sovereign | Fixed income | Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount		9	2
Other | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	8	3
Defined benefit plan, plan assets measured at net asset value	832	747
Other | Fixed income | Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	8	3
Other | Fixed income | Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount
Assets | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	36	62
Assets | Fixed income | Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	36	62
Assets | Equity securities:
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount		1
Assets | Equity securities: | Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount		1
Assets | Real estate and real assets
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	1	8
Assets | Real estate and real assets | Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount
Assets | Real estate and real assets | Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	1	8
Liabilities | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	(87)	(48)
Liabilities | Fixed income | Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	(87)	(48)
Liabilities | Equity securities:
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	(1)	(1)
Liabilities | Equity securities: | Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	(1)	(1)
Liabilities | Real estate and real assets
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	(8)	(2)
Liabilities | Real estate and real assets | Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	(7)	(2)
Liabilities | Real estate and real assets | Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	(1)
U.S. common and preferred stock | Equity securities:
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	2,931	4,463
U.S. common and preferred stock | Equity securities: | Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	2,931	4,463
Non-U.S. common and preferred stock | Equity securities:
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	2,023	3,345
Non-U.S. common and preferred stock | Equity securities: | Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	2,023	3,340
Non-U.S. common and preferred stock | Equity securities: | Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount		5	2
Boeing company stock | Equity securities:
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	1,782	1,883
Boeing company stock | Equity securities: | Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	1,782	1,883
Real estate | Real estate and real assets
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount		413
Real estate | Real estate and real assets | Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount		413
Real assets | Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	5
Real assets | Real estate and real assets
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	362	784
Real assets | Real estate and real assets | Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	310	749
Real assets | Real estate and real assets | Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	47	35
Real assets | Real estate and real assets | Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	4		$ 2
Common or collective or pooled funds | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at net asset value	1,511	1,712
Common or collective or pooled funds | Equity securities:
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets measured at net asset value	$ 2,757	$ 4,561