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Pensions And Other Postretirement Benefits - Assets and Fair Value Measurements (Details) - Pension Plan - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | $ 45,283 | $ 42,457 |
Plan assets measured at net asset value | 13,466 | 12,990 |
Other plan assets (liabilities), net | 490 | 655 |
Net plan assets | 59,239 | 56,102 | $ 62,639
U.S. | Common and preferred stocks [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 6,252 | 4,934 |
U.S. | Government and agency debt securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 13,843 | 12,077 |
U.S. | Corporate and other debt securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 24,809 | 24,645 |
U.S. | Other investments, net [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 379 | 801 |
U.S. | Investment funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets measured at net asset value | 7,031 | 6,465 |
U.S. | Private equity and debt investments [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets measured at net asset value | 2,951 | 3,021 |
U.S. | Real estate investments [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets measured at net asset value | 3,484 | 3,504 |
U.S. | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 6,185 | 5,264 |
U.S. | Level 1 | Common and preferred stocks [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 6,232 | 4,914 |
U.S. | Level 1 | Government and agency debt securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 0 | 0 |
U.S. | Level 1 | Corporate and other debt securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 0 | 0 |
U.S. | Level 1 | Other investments, net [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | (47) | 350 |
U.S. | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 38,696 | 36,820 |
U.S. | Level 2 | Common and preferred stocks [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 19 | 18 |
U.S. | Level 2 | Government and agency debt securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 13,843 | 12,077 |
U.S. | Level 2 | Corporate and other debt securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 24,809 | 24,645 |
U.S. | Level 2 | Other investments, net [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 25 | 80 |
U.S. | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 402 | 373 |
U.S. | Level 3 | Common and preferred stocks [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 1 | 2 |
U.S. | Level 3 | Government and agency debt securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 0 | 0 |
U.S. | Level 3 | Corporate and other debt securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 0 | 0 |
U.S. | Level 3 | Other investments, net [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 401 | 371 |
Non-U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 7,783 | 7,106 |
Plan assets measured at net asset value | 7,101 | 6,587 |
Other plan assets (liabilities), net | 77 | (165) |
Net plan assets | 14,961 | 13,528 | $ 14,495
Non-U.S. | Common and preferred stocks [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 490 | 447 |
Non-U.S. | Government and agency debt securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 3,927 | 3,640 |
Non-U.S. | Corporate and other debt securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 3,230 | 2,590 |
Non-U.S. | Other investments, net [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 136 | 429 |
Non-U.S. | Investment funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets measured at net asset value | 5,608 | 5,081 |
Non-U.S. | Private equity and debt investments [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets measured at net asset value | 511 | 526 |
Non-U.S. | Real estate investments [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets measured at net asset value | 982 | 980 |
Non-U.S. | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 484 | 500 |
Non-U.S. | Level 1 | Common and preferred stocks [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 489 | 441 |
Non-U.S. | Level 1 | Government and agency debt securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 0 | 0 |
Non-U.S. | Level 1 | Corporate and other debt securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 0 | 0 |
Non-U.S. | Level 1 | Other investments, net [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | (5) | 59 |
Non-U.S. | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 7,051 | 6,358 |
Non-U.S. | Level 2 | Common and preferred stocks [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 1 | 1 |
Non-U.S. | Level 2 | Government and agency debt securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 3,927 | 3,640 |
Non-U.S. | Level 2 | Corporate and other debt securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 3,230 | 2,589 |
Non-U.S. | Level 2 | Other investments, net [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | (107) | 128 |
Non-U.S. | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 248 | 248 |
Non-U.S. | Level 3 | Common and preferred stocks [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 0 | 5 |
Non-U.S. | Level 3 | Government and agency debt securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 0 | 0 |
Non-U.S. | Level 3 | Corporate and other debt securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 0 | 1 |
Non-U.S. | Level 3 | Other investments, net [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | $ 248 | $ 242 |

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