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Pension and Other Postretirement Benefits - Schedule of Additional Information About Pension Plan Assets Valued Using Net Asset Value (Details) - Fair Value Measured at Net Asset Value Per Share - Pension Plan - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Defined benefit plan assets | $ 45 | $ 238
Investment funds – fixed income |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Defined benefit plan assets | $ 25 | 108
Redemption Notice Period | 10 days |
Investment funds - global equity |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Defined benefit plan assets | $ 20 | $ 118
Redemption Notice Period | 10 days | 10 days
Investment funds - emerging markets |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Defined benefit plan assets |  | $ 5
Redemption Notice Period |  | 30 days
Investment funds – real estate |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Defined benefit plan assets |  | $ 7
Redemption Notice Period |  | 10 days
Minimum | Investment funds – fixed income |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Redemption Notice Period |  | 1 day
Maximum | Investment funds – fixed income |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Redemption Notice Period |  | 5 days

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- Definition Notice period the entity is required to deliver before it can redeem an investment calculated using net asset value per share, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but is not limited to, investments calculated by per unit, per membership interest, other equity or ownership interest and alternative investments. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 107 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-107 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A + Details
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