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Consideration of Credit Risk and Concentrations (Details)
$ in Millions

3 Months Ended

Mar. 31, 2025

USD ($)

Counterparty

Mar. 31, 2024

USD ($)

Impact of Derivative Activity [Abstract]

Fair value hedges

$ 0

$ 0

Other Derivative Instruments

Impact of Derivative Activity [Abstract]

Pre-tax fair value gains (losses) recognized during the period in accumulated other comprehensive loss

0

0

Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities

12

3

Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net

0

0

Pre-tax (gains) losses reclassified into income during the period from regulatory assets and (liabilities)

(5)

12

Pre-tax gains (losses) recognized during the period in income

(26)

(22)

Other Derivative Instruments | Electric Commodity

Impact of Derivative Activity [Abstract]

Pre-tax fair value gains (losses) recognized during the period in accumulated other comprehensive loss

0

0

Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities

5

(1)

Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net

0

0

Pre-tax (gains) losses reclassified into income during the period from regulatory assets and (liabilities)

^[1]

(5)

12

Pre-tax gains (losses) recognized during the period in income

0

0

Other Derivative Instruments | Natural Gas Commodity

Impact of Derivative Activity [Abstract]

Pre-tax fair value gains (losses) recognized during the period in accumulated other comprehensive loss

0

0

Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities

7

^[2]

4

Other Derivative Instruments | Commodity Trading

Impact of Derivative Activity [Abstract]

Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net

0

0

Pre-tax (gains) losses reclassified into income during the period from regulatory assets and (liabilities)

0

0

Pre-tax gains (losses) recognized during the period in income

^[3]

(13)

(8)

Other Derivative Instruments | Natural Gas Commodity

Impact of Derivative Activity [Abstract]

Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net

0

0

Pre-tax (gains) losses reclassified into income during the period from regulatory assets and (liabilities)

^[4]

0

0

Pre-tax gains (losses) recognized during the period in income

^[4],[5]

(13)

(14)

Designated as Hedging Instrument | Cash Flow Hedges

Impact of Derivative Activity [Abstract]

Pre-tax fair value gains (losses) recognized during the period in accumulated other comprehensive loss

(4)

29

Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities

0

0

Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net

1

1

Pre-tax (gains) losses reclassified into income during the period from regulatory assets and (liabilities)

0

0

Pre-tax gains (losses) recognized during the period in income

0

0

Designated as Hedging Instrument | Cash Flow Hedges | Interest Rate

Impact of Derivative Activity [Abstract]

Pre-tax fair value gains (losses) recognized during the period in accumulated other comprehensive loss

(4)

29

Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities

0

0

Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net

^[6]

1

1

Pre-tax (gains) losses reclassified into income during the period from regulatory assets and (liabilities)

0

0

Pre-tax gains (losses) recognized during the period in income

$ 0

$ 0

Credit Concentration Risk

Derivative [Line Items]

Number of most significant counterparties for wholesale, trading and non-trading commodity activities with credit exposure | Counterparty

10

Credit Concentration Risk | Municipal or Cooperative Entities or Other Utilities [Member]

Derivative [Line Items]

Number of most significant counterparties for wholesale, trading and non-trading commodity activities with credit exposure | Counterparty

8

Credit Concentration Risk | External Credit Rating, Investment Grade [Member]

Derivative [Line Items]

Number of most significant counterparties for wholesale, trading and non-trading commodity activities with credit exposure | Counterparty

2

Wholesale, trading and non-trading commodity credit exposure for the most significant counterparties

$ 18

Percentage of wholesale, trading and non-trading commodity credit exposure for the most significant counterparties (in hundredths)

11.00%

Credit Concentration Risk | Internal Investment Grade [Member]

Derivative [Line Items]

Number of most significant counterparties for wholesale, trading and non-trading commodity activities with credit exposure | Counterparty

7

Wholesale, trading and non-trading commodity credit exposure for the most significant counterparties

$ 79

Percentage of wholesale, trading and non-trading commodity credit exposure for the most significant counterparties (in hundredths)

47.00%

Credit Concentration Risk | External Credit Rating, Non Investment Grade [Member]

Derivative [Line Items]

Number of most significant counterparties for wholesale, trading and non-trading commodity activities with credit exposure | Counterparty

1

Wholesale, trading and non-trading commodity credit exposure for the most significant counterparties

$ 39

Percentage of wholesale, trading and non-trading commodity credit exposure for the most significant counterparties (in hundredths)

23.00%

[1]	Recorded to electric fuel and purchased power. These derivative settlement gains and losses are shared with electric customers through fuel and purchased energy cost-recovery mechanisms, and reclassified out of income as regulatory assets or liabilities, as appropriate. FTR settlements are shared with customers and do not have a material impact on net income. Presented amounts reflect changes in fair value between auction and settlement dates, but exclude the original auction fair value.
[2]	Other than $2 million of 2025 gains recorded to electric fuel and purchased power, amounts are recorded to cost of natural gas sold and transported. Amounts are subject to cost-recovery mechanisms and reclassified out of income to a regulatory asset, as appropriate.
[3]	Recorded to electric revenues. Presented amounts do not reflect non-derivative transactions or margin sharing with customers.
[4]	Other than $2 million of 2025 and 2024 losses recorded to electric fuel and purchased power, amounts are recorded to cost of natural gas sold and transported. Amounts are subject to cost-recovery mechanisms and reclassified out of income to a regulatory asset, as appropriate.
[5]	Relates primarily to option premium amortization.
[6]	Recorded to interest charges.

X

- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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