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Pensions And Other Postretirement Benefits - Assets and Fair Value Measurements (Details) - Pension Plan - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
U.S.
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	$ 32,236	$ 33,086
Plan assets measured at net asset value	11,162	12,551
Other plan assets (liabilities), net	(1,111)	(736)
Net plan assets	42,287	44,901	$ 59,921
U.S. | Common and preferred stocks
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	850	1,225
U.S. | Government and agency debt securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	9,822	9,606
U.S. | Corporate and other debt securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	20,960	21,816
U.S. | Other investments, net
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	604	439
U.S. | Investment funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at net asset value	5,322	5,124
U.S. | Private equity and debt investments
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at net asset value	2,864	3,936
U.S. | Real estate investments
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at net asset value	2,976	3,491
U.S. | Level 1
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	1,395	1,347
U.S. | Level 1 | Common and preferred stocks
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	850	1,222
U.S. | Level 1 | Government and agency debt securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	0	0
U.S. | Level 1 | Corporate and other debt securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	0	0
U.S. | Level 1 | Other investments, net
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	545	125
U.S. | Level 2
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	30,510	31,482
U.S. | Level 2 | Common and preferred stocks
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	0	0
U.S. | Level 2 | Government and agency debt securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	9,822	9,606
U.S. | Level 2 | Corporate and other debt securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	20,957	21,816
U.S. | Level 2 | Other investments, net
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	(269)	60
U.S. | Level 3
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	331	257
U.S. | Level 3 | Common and preferred stocks
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	0	3
U.S. | Level 3 | Government and agency debt securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	0	0
U.S. | Level 3 | Corporate and other debt securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	3	0
U.S. | Level 3 | Other investments, net
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	328	254
Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	5,199	4,937
Plan assets measured at net asset value	4,477	4,485
Other plan assets (liabilities), net	143	108
Net plan assets	9,819	9,530	$ 13,521
Non-U.S. | Common and preferred stocks
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	160	143
Non-U.S. | Government and agency debt securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	2,310	2,185
Non-U.S. | Corporate and other debt securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	2,745	2,571
Non-U.S. | Other investments, net
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	(16)	38
Non-U.S. | Investment funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at net asset value	3,265	3,124
Non-U.S. | Private equity and debt investments
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at net asset value	431	483
Non-U.S. | Real estate investments
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at net asset value	781	878
Non-U.S. | Level 1
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	156	167
Non-U.S. | Level 1 | Common and preferred stocks
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	160	143
Non-U.S. | Level 1 | Government and agency debt securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	0	0
Non-U.S. | Level 1 | Corporate and other debt securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	0	0
Non-U.S. | Level 1 | Other investments, net
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	(4)	24
Non-U.S. | Level 2
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	4,993	4,685
Non-U.S. | Level 2 | Common and preferred stocks
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	0	0
Non-U.S. | Level 2 | Government and agency debt securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	2,310	2,185
Non-U.S. | Level 2 | Corporate and other debt securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	2,738	2,570
Non-U.S. | Level 2 | Other investments, net
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	(55)	(70)
Non-U.S. | Level 2 | Canadian repurchase agreements
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	137	150
Non-U.S. | Level 3
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	50	85
Non-U.S. | Level 3 | Common and preferred stocks
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	0	0
Non-U.S. | Level 3 | Government and agency debt securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	0	0
Non-U.S. | Level 3 | Corporate and other debt securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	7	1
Non-U.S. | Level 3 | Other investments, net
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	$ 43	$ 84

X

- Definition

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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