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Fair Value Measurements - U.S. Pension Benefit Plans (Details) - Pension Benefit Plans - UNITED STATES - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Fair value plan assets	$ 3,249	$ 3,273	$ 3,076
Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value plan assets	3,249	3,273
Recurring | Total investment securities
Defined Benefit Plan Disclosure [Line Items]
Fair value plan assets	3,071	3,232
Recurring | Equities
Defined Benefit Plan Disclosure [Line Items]
Fair value plan assets	23	27
Recurring | Commingled funds
Defined Benefit Plan Disclosure [Line Items]
Fair value plan assets	1,443	1,709
Recurring | Government fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Fair value plan assets	239	192
Recurring | Corporate fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Fair value plan assets	905	894
Recurring | Short-term investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value plan assets	258	253
Recurring | Private assets
Defined Benefit Plan Disclosure [Line Items]
Fair value plan assets	203	157
Recurring | Accrued income receivable
Defined Benefit Plan Disclosure [Line Items]
Fair value plan assets	162	23
Recurring | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value plan assets	16	18
Recurring | Level 1 | Total investment securities
Defined Benefit Plan Disclosure [Line Items]
Fair value plan assets	1,320	1,510
Recurring | Level 1 | Equities
Defined Benefit Plan Disclosure [Line Items]
Fair value plan assets	23	27
Recurring | Level 1 | Commingled funds
Defined Benefit Plan Disclosure [Line Items]
Fair value plan assets	1,039	1,230
Recurring | Level 1 | Government fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Fair value plan assets	0	0
Recurring | Level 1 | Corporate fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Fair value plan assets	0	0
Recurring | Level 1 | Short-term investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value plan assets	258	253
Recurring | Level 1 | Private assets
Defined Benefit Plan Disclosure [Line Items]
Fair value plan assets	0	0
Recurring | Level 2 | Total investment securities
Defined Benefit Plan Disclosure [Line Items]
Fair value plan assets	1,548	1,565
Recurring | Level 2 | Equities
Defined Benefit Plan Disclosure [Line Items]
Fair value plan assets	0	0
Recurring | Level 2 | Commingled funds
Defined Benefit Plan Disclosure [Line Items]
Fair value plan assets	404	479
Recurring | Level 2 | Government fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Fair value plan assets	239	192
Recurring | Level 2 | Corporate fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Fair value plan assets	905	894
Recurring | Level 2 | Short-term investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value plan assets	0	0
Recurring | Level 2 | Private assets
Defined Benefit Plan Disclosure [Line Items]
Fair value plan assets	0	0
Recurring | Level 3 | Total investment securities
Defined Benefit Plan Disclosure [Line Items]
Fair value plan assets	203	157
Recurring | Level 3 | Equities
Defined Benefit Plan Disclosure [Line Items]
Fair value plan assets	0	0
Recurring | Level 3 | Commingled funds
Defined Benefit Plan Disclosure [Line Items]
Fair value plan assets	0	0
Recurring | Level 3 | Government fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Fair value plan assets	0	0
Recurring | Level 3 | Corporate fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Fair value plan assets	0	0
Recurring | Level 3 | Short-term investment funds
Defined Benefit Plan Disclosure [Line Items]
Fair value plan assets	0	0
Recurring | Level 3 | Private assets
Defined Benefit Plan Disclosure [Line Items]
Fair value plan assets	$ 203	$ 157

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- 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
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480482/715-20-55-17

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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