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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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