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Fair Value of Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2022
Fair Value of Financial Instruments [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
The Company’s financial assets and liabilities whose values were recognized at fair value are as follows by level within the fair value hierarchy (in millions): 
December 31, 2022
Level 1Level 2Level 3
Other(2)
Total
Assets:
Cash equivalents$150 $— $— $— $150 
Nuclear decommissioning trust: (1)
Debt securities:
Domestic government9 10 — — 19 
Corporate credit— 9 — — 9 
Money market funds measured at NAV (2)
— — — 11 11 
Non-qualified benefit plan trust: (3)
Money market funds1 — — — 1 
Equity securities—domestic3 — — — 3 
Debt securities—domestic government3 — — — 3 
Price risk management activities: (1) (4)
Electricity— 93 63 — 156 
Natural gas— 225 6 — 231 
$166 $337 $69 $11 $583 
Liabilities:
Price risk management activities: (1) (4)
Electricity$— $53 $93 $— $146 
Natural gas— 39 8 — 47 
$— $92 $101 $— $193 
(1)Activities are subject to regulation, with certain gains and losses deferred pursuant to regulatory accounting and included in regulatory assets or regulatory liabilities as appropriate.
(2)Assets are measured at NAV as a practical expedient and not subject to hierarchy level classification disclosure.
(3)Excludes insurance policies of $31 million, which are recorded at cash surrender value.
(4)For further information regarding price risk management derivatives, see Note 6, Risk Management.

December 31, 2021
Level 1Level 2Level 3
Other(2)
Total
Assets:
Cash equivalents$44 $— $— $— $44 
Nuclear decommissioning trust: (1)
Debt securities:
Domestic government9 10 — — 19 
Corporate credit— 14 — — 14 
Money market funds measured at NAV (2)
— — — 14 14 
Non-qualified benefit plan trust: (3)
Money market funds1 — — — 1 
Equity securities—domestic4 — — — 4 
Debt securities—domestic government4 — — — 4 
Price risk management activities: (1) (4)
Electricity— 16 1 — 17 
Natural gas— 115 5 — 120 
$62 $155 $6 $14 $237 
Liabilities:
Price risk management activities: (1) (4)
Electricity$— $33 $90 $— $123 
Natural gas— 13 1 — 14 
$— $46 $91 $— $137 
(1)Activities are subject to regulation, with certain gains and losses deferred pursuant to regulatory accounting and included in regulatory assets or regulatory liabilities as appropriate.
(2)Assets are measured at NAV as a practical expedient and not subject to hierarchy level classification disclosure.
(3)Excludes insurance policies of $36 million, which are recorded at cash surrender value.
(4)For further information regarding price risk management derivatives, see Note 6, Risk Management.
The fair values of the Company’s pension plan assets and other postretirement benefit plan assets by asset category are as follows (in millions):
 Level 1Level 2Level 3Other *Total
As of December 31, 2022:
Defined Benefit Pension Plan assets:
Equity securities—Domestic$16 $— $— $— $16 
Investments measured at NAV:
Money market funds— — — 4 4 
Collective trust funds— — — 525 525 
Private equity funds— — — 2 2 
$16 $— $— $531 $547 
Other Postretirement Benefit Plans assets:
Money market funds$4 $— $— $— $4 
Equity securities:
Domestic— 2 — — 2 
International3 — — — 3 
Debt securities—Domestic— 4 — — 4 
Investments measured at NAV:
Money market funds— — — 5 5 
Collective trust funds— — — 3 3 
$7 $6 $— $8 $21 
As of December 31, 2021:
Defined Benefit Pension Plan assets:
Equity securities—Domestic$25 $— $— $— $25 
Investments measured at NAV:
Money market funds— — — 6 6 
Collective trust funds— — — 764 764 
Private equity funds— — — 5 5 
$25 $— $— $775 $800 
Other Postretirement Benefit Plans assets:
Money market funds$3 $— $— $— $3 
Equity securities:
Domestic— 4 — — 4 
International10 — — — 10 
Debt securities—Domestic government— 6 — — 6 
Investments measured at NAV:
Money market funds— — — 6 6 
Collective trust funds— — — 8 8 
$13 $10 $— $14 $37 
*Assets are measured at NAV as a practical expedient and not subject to hierarchy level classification disclosure. These assets are listed in the totals of the fair value hierarchy to permit the reconciliation to amounts presented in the financial statements.
Fair Value Option, Disclosures [Table Text Block]
Quantitative information regarding the significant, unobservable inputs used in the measurement of Level 3 assets and liabilities from price risk management activities is presented below:

SignificantPrice per Unit
Fair ValueValuationUnobservableWeighted
Commodity ContractsAssetsLiabilitiesTechniqueInputLowHighAverage
(in millions)
As of December 31, 2022:
Electricity physical forwards$52 $93 Discounted cash flowElectricity forward price (per MWh)$35.00 $270.00 $101.27 
Natural gas financial swaps6 8 Discounted cash flowNatural gas forward price (per Dth)2.71 24.71 4.42 
Electricity financial futures11 — Discounted cash flowElectricity forward price (per MWh)54.17 143.70 104.21 
$69 $101 
As of December 31, 2021:
Electricity physical forwards$— $90 Discounted cash flowElectricity forward price (per MWh)$16.66 $129.75 $43.73 
Natural gas financial swaps5 1 Discounted cash flowNatural gas forward price (per Dth)2.02 8.02 2.81 
Electricity financial futures1 — Discounted cash flowElectricity forward price (per MWh)26.76 68.43 52.46 
$6 $91 
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
Changes in the fair value of net liabilities from price risk management activities (net of assets from price risk management activities) classified as Level 3 in the fair value hierarchy were as follows (in millions):

Years Ended December 31,
20222021
Net liabilities from price risk management activities as of beginning of year$85 $137 
Net realized and unrealized losses/(gains) *(84)(50)
Net transfers from Level 3 to Level 231 (2)
Net liabilities from price risk management activities as of end of year$32 $85 
Level 3 net unrealized losses/(gains) that have been fully offset by the effect of regulatory accounting$(82)$(55)
* Includes $2 million in net realized gains in 2022 and $5 million in 2021.