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Pensions And Other Postretirement Benefits - Assets and Fair Value Measurements (Details) - Pension Plan - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | $ 33,086 | $ 44,230 |
Plan assets measured at net asset value | 12,551 | 15,323 |
Other plan assets (liabilities), net | (736) | 368 |
Net plan assets | 44,901 | 59,921 | $ 61,077
U.S. | Common and preferred stocks |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 1,225 | 2,554 |
U.S. | Government and agency debt securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 9,606 | 14,924 |
U.S. | Corporate and other debt securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 21,816 | 26,064 |
U.S. | Other investments, net |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 439 | 688 |
U.S. | Investment funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets measured at net asset value | 5,124 | 7,304 |
U.S. | Private equity and debt investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets measured at net asset value | 3,936 | 4,415 |
U.S. | Real estate investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets measured at net asset value | 3,491 | 3,604 |
U.S. | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 1,347 | 2,975 |
U.S. | Level 1 | Common and preferred stocks |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 1,222 | 2,554 |
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 | 125 | 421 |
U.S. | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 31,482 | 41,009 |
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 | 9,606 | 14,924 |
U.S. | Level 2 | Corporate and other debt securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 21,816 | 26,064 |
U.S. | Level 2 | Other investments, net |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 60 | 21 |
U.S. | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 257 | 246 |
U.S. | Level 3 | Common and preferred stocks |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 3 | 0 |
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 | 0 | 0 |
U.S. | Level 3 | Other investments, net |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 254 | 246 |
Non-U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 4,937 | 6,939 |
Plan assets measured at net asset value | 4,485 | 6,545 |
Other plan assets (liabilities), net | 108 | 37 |
Net plan assets | 9,530 | 13,521 | $ 13,846
Non-U.S. | Common and preferred stocks |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 143 | 372 |
Non-U.S. | Government and agency debt securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 2,185 | 3,084 |
Non-U.S. | Corporate and other debt securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 2,571 | 3,381 |
Non-U.S. | Other investments, net |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 38 | 102 |
Non-U.S. | Investment funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets measured at net asset value | 3,124 | 4,963 |
Non-U.S. | Private equity and debt investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets measured at net asset value | 483 | 593 |
Non-U.S. | Real estate investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets measured at net asset value | 878 | 989 |
Non-U.S. | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 167 | 424 |
Non-U.S. | Level 1 | Common and preferred stocks |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 143 | 372 |
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 | 24 | 52 |
Non-U.S. | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 4,685 | 6,397 |
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 | 2,185 | 3,084 |
Non-U.S. | Level 2 | Corporate and other debt securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 2,570 | 3,379 |
Non-U.S. | Level 2 | Other investments, net |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | (70) | (66) |
Non-U.S. | Level 2 | Canadian repurchase agreements |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 150 | 271 |
Non-U.S. | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 85 | 118 |
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 | 1 | 2 |
Non-U.S. | Level 3 | Other investments, net |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | $ 84 | $ 116 |

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