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Pensions And Other Postretirement Benefits Assets and Fair Value Measurements (Details) - Pension Plan [Member] - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
U.S. [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | $ 42,457 | $ 48,215 |
Plan assets measured at net asset value | 12,990 | 13,522 |
Other plan assets (liabilities), net | 655 | 902 |
Net plan assets | 56,102 | 62,639 | $ 61,622
U.S. [Member] | Common and preferred stocks [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 4,934 | 8,911 |
U.S. [Member] | Government and agency debt securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 12,077 | 12,116 |
U.S. [Member] | Corporate and other debt securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 24,645 | 26,122 |
U.S. [Member] | Other investments, net [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 801 | 1,066 |
U.S. [Member] | Investment funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets measured at net asset value | 6,465 | 6,632 |
U.S. [Member] | Private equity and debt investments [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets measured at net asset value | 3,021 | 3,539 |
U.S. [Member] | Real estate investments [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets measured at net asset value | 3,504 | 3,351 |
U.S. [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 5,264 | 9,444 |
U.S. [Member] | Level 1 [Member] | Common and preferred stocks [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 4,914 | 8,892 |
U.S. [Member] | Level 1 [Member] | Government and agency debt securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 0 | 0 |
U.S. [Member] | Level 1 [Member] | Corporate and other debt securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 0 | 0 |
U.S. [Member] | Level 1 [Member] | Other investments, net [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 350 | 552 |
U.S. [Member] | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 36,820 | 38,374 |
U.S. [Member] | Level 2 [Member] | Common and preferred stocks [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 18 | 17 |
U.S. [Member] | Level 2 [Member] | Government and agency debt securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 12,077 | 12,116 |
U.S. [Member] | Level 2 [Member] | Corporate and other debt securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 24,645 | 26,122 |
U.S. [Member] | Level 2 [Member] | Other investments, net [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 80 | 119 |
U.S. [Member] | Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 373 | 397 |
U.S. [Member] | Level 3 [Member] | Common and preferred stocks [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 2 | 2 |
U.S. [Member] | Level 3 [Member] | Government and agency debt securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 0 | 0 |
U.S. [Member] | Level 3 [Member] | Corporate and other debt securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 0 | 0 |
U.S. [Member] | Level 3 [Member] | Other investments, net [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 371 | 395 |
Non-U.S. [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 7,106 | 7,614 |
Plan assets measured at net asset value | 6,587 | 7,013 |
Other plan assets (liabilities), net | (165) | (132) |
Net plan assets | 13,528 | 14,495 | $ 12,799
Non-U.S. [Member] | Common and preferred stocks [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 447 | 585 |
Non-U.S. [Member] | Government and agency debt securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 3,640 | 3,853 |
Non-U.S. [Member] | Corporate and other debt securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 2,590 | 2,566 |
Non-U.S. [Member] | Other investments, net [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 429 | 610 |
Non-U.S. [Member] | Investment funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets measured at net asset value | 5,081 | 5,346 |
Non-U.S. [Member] | Private equity and debt investments [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets measured at net asset value | 526 | 570 |
Non-U.S. [Member] | Real estate investments [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets measured at net asset value | 980 | 1,097 |
Non-U.S. [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 500 | 601 |
Non-U.S. [Member] | Level 1 [Member] | Common and preferred stocks [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 441 | 578 |
Non-U.S. [Member] | Level 1 [Member] | Government and agency debt securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 0 | 0 |
Non-U.S. [Member] | Level 1 [Member] | Corporate and other debt securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 0 | 0 |
Non-U.S. [Member] | Level 1 [Member] | Other investments, net [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 59 | 23 |
Non-U.S. [Member] | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 6,358 | 6,569 |
Non-U.S. [Member] | Level 2 [Member] | Common and preferred stocks [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 1 | 1 |
Non-U.S. [Member] | Level 2 [Member] | Government and agency debt securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 3,640 | 3,853 |
Non-U.S. [Member] | Level 2 [Member] | Corporate and other debt securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 2,589 | 2,566 |
Non-U.S. [Member] | Level 2 [Member] | Other investments, net [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 128 | 149 |
Non-U.S. [Member] | Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 248 | 444 |
Non-U.S. [Member] | Level 3 [Member] | Common and preferred stocks [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 5 | 6 |
Non-U.S. [Member] | Level 3 [Member] | Government and agency debt securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 0 | 0 |
Non-U.S. [Member] | Level 3 [Member] | Corporate and other debt securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | 1 | 0 |
Non-U.S. [Member] | Level 3 [Member] | Other investments, net [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net plan assets subject to leveling | $ 242 | $ 438 |

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