Commitments and Contingencies - Contractual Obligation, Fiscal Year Maturity (Details) $ in Millions	Dec. 31, 2024 USD ($)
Long-Term Service and Maintenance Contracts
Long-term Purchase Commitment [Line Items]
2025	$ 227
2026	206
2027	207
2028	265
2029	259
Thereafter	1,916
Total	3,080
Coal transportation agreements
Long-term Purchase Commitment [Line Items]
2025	59
2026	26
2027	26
2028	0
2029	0
Thereafter	0
Total	111
Pipeline transportation and storage reservation fees
Long-term Purchase Commitment [Line Items]
2025	187
2026	200
2027	209
2028	228
2029	234
Thereafter	115
Total	1,173
Water Contracts
Long-term Purchase Commitment [Line Items]
2025	9
2026	9
2027	9
2028	9
2029	9
Thereafter	37
Total	$ 82

Amount of contractual obligation, including, but not limited to, long-term debt, lease obligation, purchase obligation, and other commitments.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-3

+ Details

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- Definition

Amount of contractual obligation to be paid after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

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- Definition

Amount of contractual obligation to be paid in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

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- Definition

Amount of contractual obligation to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

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- Definition

Amount of contractual obligation to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

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- Definition

Amount of contractual obligation to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

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- Definition

Amount of contractual obligation to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

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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.

+ Details

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- Details

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