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Pensions And Other Postretirement Benefits - Assets and Fair Value Measurements (Details) - Pension Plan - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
U.S.
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	$ 44,230	$ 46,721
Plan assets measured at net asset value	15,323	13,732
Other plan assets (liabilities), net	368	624
Net plan assets	59,921	61,077	$ 59,239
U.S. | Common and preferred stocks
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	2,554	7,430
U.S. | Government and agency debt securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	14,924	13,231
U.S. | Corporate and other debt securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	26,064	26,475
U.S. | Other investments, net
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	688	(415)
U.S. | Investment funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at net asset value	7,304	7,534
U.S. | Private equity and debt investments
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at net asset value	4,415	3,137
U.S. | Real estate investments
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at net asset value	3,604	3,061
U.S. | Level 1
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	2,975	6,595
U.S. | Level 1 | Common and preferred stocks
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	2,554	7,429
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	421	(834)
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	41,009	39,698
U.S. | Level 2 | Common and preferred stocks
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	0	0
U.S. | Level 2 | Government and agency debt securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	14,924	13,231
U.S. | Level 2 | Corporate and other debt securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	26,064	26,475
U.S. | Level 2 | Other investments, net
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	21	(8)
U.S. | Level 3
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	246	428
U.S. | Level 3 | Common and preferred stocks
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	0	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	246	427
Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	6,939	6,591
Plan assets measured at net asset value	6,545	7,276
Other plan assets (liabilities), net	37	(21)
Net plan assets	13,521	13,846	$ 14,961
Non-U.S. | Common and preferred stocks
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	372	572
Non-U.S. | Government and agency debt securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	3,084	3,178
Non-U.S. | Corporate and other debt securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	3,381	2,762
Non-U.S. | Other investments, net
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	102	79
Non-U.S. | Investment funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at net asset value	4,963	5,870
Non-U.S. | Private equity and debt investments
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at net asset value	593	489
Non-U.S. | Real estate investments
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured at net asset value	989	917
Non-U.S. | Level 1
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	424	603
Non-U.S. | Level 1 | Common and preferred stocks
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	372	572
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	52	31
Non-U.S. | Level 2
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	6,397	5,861
Non-U.S. | Level 2 | Common and preferred stocks
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	0	0
Non-U.S. | Level 2 | Government and agency debt securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	3,084	3,178
Non-U.S. | Level 2 | Corporate and other debt securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	3,379	2,762
Non-U.S. | Level 2 | Other investments, net
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	(66)	(79)
Non-U.S. | Level 3
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	118	127
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	2	0
Non-U.S. | Level 3 | Other investments, net
Defined Benefit Plan Disclosure [Line Items]
Net plan assets subject to leveling	$ 116	$ 127

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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