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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

X

- Definition

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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