Pension and Other Postretirement Employee Benefits (OPEB) Plans - Schedule of Expected Benefit Payments (Details) $ in Millions	Dec. 31, 2023 USD ($)
Pension costs
Defined Benefit Plans and Other Postretirement Benefit Plans
2024	$ 52
2025	30
2026	36
2027	37
2028	29
2029-2033	142
OPEB costs
Defined Benefit Plans and Other Postretirement Benefit Plans
2024	10
2025	9
2026	9
2027	9
2028	8
2029-2033	$ 37

Amount of benefit for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following current fiscal year.

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

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Amount of benefit for defined benefit plan expected to be paid in next fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in fifth fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in fourth fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in third fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in second fiscal year following current fiscal year.

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