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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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- Definition

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