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Commitments and Contingencies - Contractual Obligation, Fiscal Year Maturity (Details) $ in Millions	Dec. 31, 2023 USD ($)
Long-Term Service and Maintenance Contracts
Long-term Purchase Commitment [Line Items]
2024	$ 286
2025	242
2026	228
2027	250
2028	310
Thereafter	2,091
Total	3,407
Coal transportation agreements
Long-term Purchase Commitment [Line Items]
2024	33
2025	34
2026	35
2027	36
2028	0
Thereafter	0
Total	138
Pipeline transportation and storage reservation fees
Long-term Purchase Commitment [Line Items]
2024	179
2025	182
2026	192
2027	195
2028	194
Thereafter	96
Total	1,038
Water Contracts
Long-term Purchase Commitment [Line Items]
2024	9
2025	9
2026	9
2027	9
2028	9
Thereafter	44
Total	$ 89

X

- Definition

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

+ References

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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X

- 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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X

- 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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X

- 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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