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Pensions And Other Postretirement Benefits - Assets and Fair Value Measurements (Details) - Pension Plan - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
U.S.
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	$ 46,721	$ 45,283
Plan assets measured at net asset value	13,732	13,466
Other plan assets (liabilities), net	624	490
Net plan assets	61,077	59,239	$ 56,102
U.S. | Common and preferred stocks
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	7,430	6,252
U.S. | Government and agency debt securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	13,231	13,843
U.S. | Corporate and other debt securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	26,475	24,809
U.S. | Other investments, net
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	(415)	379
U.S. | Investment funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at net asset value	7,534	7,031
U.S. | Private equity and debt investments
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at net asset value	3,137	2,951
U.S. | Real estate investments
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at net asset value	3,061	3,484
U.S. | Level 1
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	6,595	6,185
U.S. | Level 1 | Common and preferred stocks
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	7,429	6,232
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	(834)	(47)
U.S. | Level 1 | Equity options and futures contracts
Defined Benefit Plan Disclosure [Line Items]
Net derivative liability	1,000
U.S. | Level 2
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	39,698	38,696
U.S. | Level 2 | Common and preferred stocks
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	0	19
U.S. | Level 2 | Government and agency debt securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	13,231	13,843
U.S. | Level 2 | Corporate and other debt securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	26,475	24,809
U.S. | Level 2 | Other investments, net
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	(8)	25
U.S. | Level 3
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	428	402
U.S. | Level 3 | Common and preferred stocks
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	1	1
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	427	401
Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	6,591	7,783
Plan assets measured at net asset value	7,276	7,101
Other plan assets (liabilities), net	(21)	77
Net plan assets	13,846	14,961	$ 13,528
Non-U.S. | Common and preferred stocks
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	572	490
Non-U.S. | Government and agency debt securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	3,178	3,927
Non-U.S. | Corporate and other debt securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	2,762	3,230
Non-U.S. | Other investments, net
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	79	136
Non-U.S. | Investment funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at net asset value	5,870	5,608
Non-U.S. | Private equity and debt investments
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at net asset value	489	511
Non-U.S. | Real estate investments
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at net asset value	917	982
Non-U.S. | Level 1
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	603	484
Non-U.S. | Level 1 | Common and preferred stocks
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	572	489
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	31	(5)
Non-U.S. | Level 2
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	5,861	7,051
Non-U.S. | Level 2 | Common and preferred stocks
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	0	1
Non-U.S. | Level 2 | Government and agency debt securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	3,178	3,927
Non-U.S. | Level 2 | Corporate and other debt securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	2,762	3,230
Non-U.S. | Level 2 | Other investments, net
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	(79)	(107)
Non-U.S. | Level 3
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	127	248
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	0	0
Non-U.S. | Level 3 | Other investments, net
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	$ 127	$ 248

X

- Definition

Other plan assets and liabilities including, cash held by the plans, net of amounts receivable/payable for unsettled security transactions and payable for investment manager fees, custody fees and other expenses.

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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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