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Pensions and Other Postretirement Benefits - Fair Value of Plan Assets (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 2,551	$ 2,503
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,079	1,239
Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,472	1,264
Common stock
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,054	1,192
Common stock | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,054	1,192
Common stock | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
International equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	362	371
International equity securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
International equity securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	362	371
Debt securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	637	310
Debt securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Debt securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	637	310
Domestic equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	346	166
Domestic equity securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Domestic equity securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	346	166
Government and agencies securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4	170
Government and agencies securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Government and agencies securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4	170
Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		93
Corporate bonds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
Corporate bonds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		93
Mortgage and other asset-backed securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		32
Mortgage and other asset-backed securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
Mortgage and other asset-backed securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		32
Commingled funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	123	122
Commingled funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Commingled funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	123	122
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	25	47
Cash and cash equivalents | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	25	47
Cash and cash equivalents | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0	$ 0

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

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)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(ii)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
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-Paragraph 1
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 6: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
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-Paragraph 1
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Reference 7: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
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-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(01)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

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