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Pensions and Other Postretirement Benefits - Fair Value of Plan Assets (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 2,503	$ 2,260
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,239	1,066
Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,264	1,194
Common stock
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,192	1,011
Common stock | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,192	1,011
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	371	336
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	371	336
Debt securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	310	291
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	310	291
Domestic equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	166	160
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	166	160
Government and agencies securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	170	158
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	170	158
Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	93	100
Corporate bonds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Corporate bonds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	93	100
Mortgage and other asset-backed securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	32	28
Mortgage and other asset-backed securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Mortgage and other asset-backed securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	32	28
Commingled funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	122	121
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	122	121
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	47	55
Cash and cash equivalents | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	47	55
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
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-Section 50
-Paragraph 1
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-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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-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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Reference 7: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
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-Paragraph 1
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