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Pension and Postretirement Benefit Plans - Pension Asset Fair Values (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Levels 1, 2 and 3 | International
Benefit Plan Information
Fair value of plan assets	$ 5,397	$ 6,341
Defined Benefit Plan Assets, Excluding Reconciling Items | Level 1 | International
Benefit Plan Information
Fair value of plan assets	485	490
Defined Benefit Plan Assets, Excluding Reconciling Items | Level 2 | International
Benefit Plan Information
Fair value of plan assets	3,808	4,149
Defined Benefit Plan Assets, Excluding Reconciling Items | Level 3 | International
Benefit Plan Information
Fair value of plan assets	507	588
Defined Benefit Plan Assets, Excluding Reconciling Items | Investments Measured at Net Asset Value | International
Benefit Plan Information
Fair value of plan assets	851	1,315
Defined Benefit Plan Assets, Excluding Reconciling Items | Levels 1, 2 and 3 | International
Benefit Plan Information
Fair value of plan assets	5,651	6,542
Equities | Level 1 | International
Benefit Plan Information
Fair value of plan assets	231	226
Equities | Level 2 | International
Benefit Plan Information
Fair value of plan assets	437	513
Equities | Level 3 | International
Benefit Plan Information
Fair value of plan assets	1	1
Equities | Investments Measured at Net Asset Value | International
Benefit Plan Information
Fair value of plan assets	2	45
Equities | Levels 1, 2 and 3 | International
Benefit Plan Information
Fair value of plan assets	671	785
Fixed income | Level 1 | International
Benefit Plan Information
Fair value of plan assets	150	148
Fixed income | Level 2 | International
Benefit Plan Information
Fair value of plan assets	3,248	3,501
Fixed income | Level 3 | International
Benefit Plan Information
Fair value of plan assets	2	2
Fixed income | Investments Measured at Net Asset Value | International
Benefit Plan Information
Fair value of plan assets	1	719
Fixed income | Levels 1, 2 and 3 | International
Benefit Plan Information
Fair value of plan assets	3,401	4,370
Private equity | Level 1 | International
Benefit Plan Information
Fair value of plan assets	0	0
Private equity | Level 2 | International
Benefit Plan Information
Fair value of plan assets	21	58
Private equity | Level 3 | International
Benefit Plan Information
Fair value of plan assets	1	2
Private equity | Investments Measured at Net Asset Value | International
Benefit Plan Information
Fair value of plan assets	736	361
Private equity | Levels 1, 2 and 3 | International
Benefit Plan Information
Fair value of plan assets	758	421
Absolute return | Level 1 | International
Benefit Plan Information
Fair value of plan assets	5	10
Absolute return | Level 2 | International
Benefit Plan Information
Fair value of plan assets	44	1
Absolute return | Level 3 | International
Benefit Plan Information
Fair value of plan assets	503	583
Absolute return | Investments Measured at Net Asset Value | International
Benefit Plan Information
Fair value of plan assets	112	189
Absolute return | Levels 1, 2 and 3 | International
Benefit Plan Information
Fair value of plan assets	664	783
Cash and cash equivalents | Level 1 | International
Benefit Plan Information
Fair value of plan assets	99	106
Cash and cash equivalents | Level 2 | International
Benefit Plan Information
Fair value of plan assets	58	76
Cash and cash equivalents | Level 3 | International
Benefit Plan Information
Fair value of plan assets	0	0
Cash and cash equivalents | Investments Measured at Net Asset Value | International
Benefit Plan Information
Fair value of plan assets	0	1
Cash and cash equivalents | Levels 1, 2 and 3 | International
Benefit Plan Information
Fair value of plan assets	157	183
Other items to reconcile to fair value of plan assets | Levels 1, 2 and 3 | International
Benefit Plan Information
Fair value of plan assets	(254)	(201)
U.S. Pension Plans | United States
Benefit Plan Information
Fair value of plan assets	7,498	12,348	$ 12,648
U.S. Pension Plans | International
Benefit Plan Information
Fair value of plan assets	5,397	6,341	5,891
U.S. Pension Plans | Levels 1, 2 and 3 | United States
Benefit Plan Information
Fair value of plan assets	7,498	12,348
U.S. Pension Plans | Defined Benefit Plan Assets, Excluding Reconciling Items | Level 1 | United States
Benefit Plan Information
Fair value of plan assets	2,583	2,407
U.S. Pension Plans | Defined Benefit Plan Assets, Excluding Reconciling Items | Level 2 | United States
Benefit Plan Information
Fair value of plan assets	2,795	6,511
U.S. Pension Plans | Defined Benefit Plan Assets, Excluding Reconciling Items | Level 3 | United States
Benefit Plan Information
Fair value of plan assets	13	0
U.S. Pension Plans | Defined Benefit Plan Assets, Excluding Reconciling Items | Investments Measured at Net Asset Value | United States
Benefit Plan Information
Fair value of plan assets	2,354	3,867
U.S. Pension Plans | Defined Benefit Plan Assets, Excluding Reconciling Items | Levels 1, 2 and 3 | United States
Benefit Plan Information
Fair value of plan assets	7,745	12,785
U.S. Pension Plans | Equities | Level 1 | United States
Benefit Plan Information
Fair value of plan assets	1,318	1,246
U.S. Pension Plans | Equities | Level 2 | United States
Benefit Plan Information
Fair value of plan assets	0	0
U.S. Pension Plans | Equities | Level 3 | United States
Benefit Plan Information
Fair value of plan assets	0	0
U.S. Pension Plans | Equities | Investments Measured at Net Asset Value | United States
Benefit Plan Information
Fair value of plan assets	0	174
U.S. Pension Plans | Equities | Levels 1, 2 and 3 | United States
Benefit Plan Information
Fair value of plan assets	1,318	1,420
U.S. Pension Plans | Fixed income | Level 1 | United States
Benefit Plan Information
Fair value of plan assets	1,227	1,153
U.S. Pension Plans | Fixed income | Level 2 | United States
Benefit Plan Information
Fair value of plan assets	2,774	6,428
U.S. Pension Plans | Fixed income | Level 3 | United States
Benefit Plan Information
Fair value of plan assets	0	0
U.S. Pension Plans | Fixed income | Investments Measured at Net Asset Value | United States
Benefit Plan Information
Fair value of plan assets	0	16
U.S. Pension Plans | Fixed income | Levels 1, 2 and 3 | United States
Benefit Plan Information
Fair value of plan assets	4,001	7,597
U.S. Pension Plans | Private equity | Level 1 | United States
Benefit Plan Information
Fair value of plan assets	0	0
U.S. Pension Plans | Private equity | Level 2 | United States
Benefit Plan Information
Fair value of plan assets	0	0
U.S. Pension Plans | Private equity | Level 3 | United States
Benefit Plan Information
Fair value of plan assets	13	0
U.S. Pension Plans | Private equity | Investments Measured at Net Asset Value | United States
Benefit Plan Information
Fair value of plan assets	1,179	1,622
U.S. Pension Plans | Private equity | Levels 1, 2 and 3 | United States
Benefit Plan Information
Fair value of plan assets	1,192	1,622
U.S. Pension Plans | Absolute return | Level 1 | United States
Benefit Plan Information
Fair value of plan assets	0	1
U.S. Pension Plans | Absolute return | Level 2 | United States
Benefit Plan Information
Fair value of plan assets	7	83
U.S. Pension Plans | Absolute return | Level 3 | United States
Benefit Plan Information
Fair value of plan assets	0	0
U.S. Pension Plans | Absolute return | Investments Measured at Net Asset Value | United States
Benefit Plan Information
Fair value of plan assets	899	1,314
U.S. Pension Plans | Absolute return | Levels 1, 2 and 3 | United States
Benefit Plan Information
Fair value of plan assets	906	1,398
U.S. Pension Plans | Cash and cash equivalents | Level 1 | United States
Benefit Plan Information
Fair value of plan assets	38	7
U.S. Pension Plans | Cash and cash equivalents | Level 2 | United States
Benefit Plan Information
Fair value of plan assets	14	0
U.S. Pension Plans | Cash and cash equivalents | Level 3 | United States
Benefit Plan Information
Fair value of plan assets	0	0
U.S. Pension Plans | Cash and cash equivalents | Investments Measured at Net Asset Value | United States
Benefit Plan Information
Fair value of plan assets	276	741
U.S. Pension Plans | Cash and cash equivalents | Levels 1, 2 and 3 | United States
Benefit Plan Information
Fair value of plan assets	328	748
U.S. Pension Plans | Other items to reconcile to fair value of plan assets | Levels 1, 2 and 3 | United States
Benefit Plan Information
Fair value of plan assets	(247)	(437)
Postretirement Benefits
Benefit Plan Information
Fair value of plan assets	761	980	$ 1,017
Postretirement Benefits | Levels 1, 2 and 3 | United States
Benefit Plan Information
Fair value of plan assets	761	980
Postretirement Benefits | Defined Benefit Plan Assets, Excluding Reconciling Items | Level 1 | United States
Benefit Plan Information
Fair value of plan assets	258	245
Postretirement Benefits | Defined Benefit Plan Assets, Excluding Reconciling Items | Level 2 | United States
Benefit Plan Information
Fair value of plan assets	310	508
Postretirement Benefits | Defined Benefit Plan Assets, Excluding Reconciling Items | Level 3 | United States
Benefit Plan Information
Fair value of plan assets	1	0
Postretirement Benefits | Defined Benefit Plan Assets, Excluding Reconciling Items | Investments Measured at Net Asset Value | United States
Benefit Plan Information
Fair value of plan assets	216	256
Postretirement Benefits | Defined Benefit Plan Assets, Excluding Reconciling Items | Levels 1, 2 and 3 | United States
Benefit Plan Information
Fair value of plan assets	785	1,009
Postretirement Benefits | Equities | Level 1 | United States
Benefit Plan Information
Fair value of plan assets	122	118
Postretirement Benefits | Equities | Level 2 | United States
Benefit Plan Information
Fair value of plan assets	0	0
Postretirement Benefits | Equities | Level 3 | United States
Benefit Plan Information
Fair value of plan assets	0	0
Postretirement Benefits | Equities | Investments Measured at Net Asset Value | United States
Benefit Plan Information
Fair value of plan assets	0	11
Postretirement Benefits | Equities | Levels 1, 2 and 3 | United States
Benefit Plan Information
Fair value of plan assets	122	129
Postretirement Benefits | Fixed income | Level 1 | United States
Benefit Plan Information
Fair value of plan assets	129	92
Postretirement Benefits | Fixed income | Level 2 | United States
Benefit Plan Information
Fair value of plan assets	305	503
Postretirement Benefits | Fixed income | Level 3 | United States
Benefit Plan Information
Fair value of plan assets	0	0
Postretirement Benefits | Fixed income | Investments Measured at Net Asset Value | United States
Benefit Plan Information
Fair value of plan assets	0	1
Postretirement Benefits | Fixed income | Levels 1, 2 and 3 | United States
Benefit Plan Information
Fair value of plan assets	434	596
Postretirement Benefits | Private equity | Level 1 | United States
Benefit Plan Information
Fair value of plan assets	0	0
Postretirement Benefits | Private equity | Level 2 | United States
Benefit Plan Information
Fair value of plan assets	0	0
Postretirement Benefits | Private equity | Level 3 | United States
Benefit Plan Information
Fair value of plan assets	1	0
Postretirement Benefits | Private equity | Investments Measured at Net Asset Value | United States
Benefit Plan Information
Fair value of plan assets	110	108
Postretirement Benefits | Private equity | Levels 1, 2 and 3 | United States
Benefit Plan Information
Fair value of plan assets	111	108
Postretirement Benefits | Absolute return | Level 1 | United States
Benefit Plan Information
Fair value of plan assets	0	0
Postretirement Benefits | Absolute return | Level 2 | United States
Benefit Plan Information
Fair value of plan assets	4	5
Postretirement Benefits | Absolute return | Level 3 | United States
Benefit Plan Information
Fair value of plan assets	0	0
Postretirement Benefits | Absolute return | Investments Measured at Net Asset Value | United States
Benefit Plan Information
Fair value of plan assets	80	87
Postretirement Benefits | Absolute return | Levels 1, 2 and 3 | United States
Benefit Plan Information
Fair value of plan assets	84	92
Postretirement Benefits | Cash and cash equivalents | Level 1 | United States
Benefit Plan Information
Fair value of plan assets	7	35
Postretirement Benefits | Cash and cash equivalents | Level 2 | United States
Benefit Plan Information
Fair value of plan assets	1	0
Postretirement Benefits | Cash and cash equivalents | Level 3 | United States
Benefit Plan Information
Fair value of plan assets	0	0
Postretirement Benefits | Cash and cash equivalents | Investments Measured at Net Asset Value | United States
Benefit Plan Information
Fair value of plan assets	26	49
Postretirement Benefits | Cash and cash equivalents | Levels 1, 2 and 3 | United States
Benefit Plan Information
Fair value of plan assets	34	84
Postretirement Benefits | Other items to reconcile to fair value of plan assets | Levels 1, 2 and 3 | United States
Benefit Plan Information
Fair value of plan assets	$ (24)	$ (29)

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+ References

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480482/715-20-55-17

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(02)
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Section 50
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Reference 6: http://www.xbrl.org/2003/role/exampleRef
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Reference 7: http://www.xbrl.org/2003/role/exampleRef
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