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Pensions And Other Postretirement Benefits - Assets and Fair Value Measurements (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
U.S.
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	$ 38,298	$ 42,287
U.S. | Common and preferred stocks
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	15	850
U.S. | Government and agency debt securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	11,728	9,822
U.S. | Corporate and other debt securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	15,155	20,960
U.S. | Other investments, net
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	(3,348)	604
U.S. | Investment funds
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	10,025	5,322
U.S. | Private equity and debt investments
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	2,961	2,864
U.S. | Real estate investments
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	2,655	2,976
U.S. | Other plan assets (liabilities), net
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	(893)	(1,111)
U.S. | Fair Value, Inputs, Level 1, Level 2, and Level 3
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	23,550	32,236
U.S. | Level 1
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	(60)	1,395
U.S. | Level 1 | Common and preferred stocks
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	15	850
U.S. | Level 1 | Government and agency debt securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	0	0
U.S. | Level 1 | Corporate and other debt securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	0	0
U.S. | Level 1 | Other investments, net
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	(75)	545
U.S. | Level 2
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	23,221	30,510
U.S. | Level 2 | Common and preferred stocks
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	0	0
U.S. | Level 2 | Government and agency debt securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	11,728	9,822
U.S. | Level 2 | Corporate and other debt securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	15,155	20,957
U.S. | Level 2 | Other investments, net
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	(3,662)	(269)
U.S. | Level 2 | Canadian repurchase agreements
Defined Benefit Plan Disclosure [Line Items]
Net plan assets		3,600
U.S. | Level 3
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	389	331
U.S. | Level 3 | Common and preferred stocks
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	0	0
U.S. | Level 3 | Government and agency debt securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	0	0
U.S. | Level 3 | Corporate and other debt securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	0	3
U.S. | Level 3 | Other investments, net
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	389	328
U.S. | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	15,641	11,162
Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	9,121	9,819
Non-U.S. | Common and preferred stocks
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	98	160
Non-U.S. | Government and agency debt securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	2,267	2,310
Non-U.S. | Corporate and other debt securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	2,344	2,745
Non-U.S. | Other investments, net
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	(108)	(16)
Non-U.S. | Investment funds
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	3,303	3,265
Non-U.S. | Private equity and debt investments
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	406	431
Non-U.S. | Real estate investments
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	689	781
Non-U.S. | Other plan assets (liabilities), net
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	122	143
Non-U.S. | Fair Value, Inputs, Level 1, Level 2, and Level 3
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	4,601	5,199
Non-U.S. | Level 1
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	106	156
Non-U.S. | Level 1 | Common and preferred stocks
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	98	160
Non-U.S. | Level 1 | Government and agency debt securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	0	0
Non-U.S. | Level 1 | Corporate and other debt securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	0	0
Non-U.S. | Level 1 | Other investments, net
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	8	(4)
Non-U.S. | Level 2
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	4,447	4,993
Non-U.S. | Level 2 | Common and preferred stocks
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	0	0
Non-U.S. | Level 2 | Government and agency debt securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	2,262	2,310
Non-U.S. | Level 2 | Corporate and other debt securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	2,336	2,738
Non-U.S. | Level 2 | Other investments, net
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	(151)	(55)
Non-U.S. | Level 2 | Canadian repurchase agreements
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	185	137
Non-U.S. | Level 3
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	48	50
Non-U.S. | Level 3 | Common and preferred stocks
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	0	0
Non-U.S. | Level 3 | Government and agency debt securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	5	0
Non-U.S. | Level 3 | Corporate and other debt securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	8	7
Non-U.S. | Level 3 | Other investments, net
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	35	43
Non-U.S. | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	$ 4,398	$ 4,477

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