v3.25.2
Fair Value of Financial Assets and Liabilities - Recurring Fair Value Measurements (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Derivatives, Fair Value [Line Items]          
Return Cash Collateral $ 0   $ 0   $ 0
Reclaim Cash Collateral 1   1    
Other Derivative Instruments          
Derivatives, Fair Value [Line Items]          
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred 0   0 $ 0  
Pre-tax gains (losses) recognized during the period in income 2   (7) (16)  
Other Derivative Instruments | Natural Gas Commodity          
Derivatives, Fair Value [Line Items]          
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred     0 0  
Pre-tax gains (losses) recognized during the period in income [1],[2]     (9) (8)  
Other Derivative Instruments | Natural Gas Commodity | Electric fuel and purchased power          
Derivatives, Fair Value [Line Items]          
Pre-tax (gains) losses reclassified into income during the period from regulatory assets and (liabilities)     2 2  
Other Derivative Instruments | Commodity Trading          
Derivatives, Fair Value [Line Items]          
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred 0   0 0  
Pre-tax gains (losses) recognized during the period in income [3] 2   2 (8)  
Designated as Hedging Instrument | Cash Flow Hedges          
Derivatives, Fair Value [Line Items]          
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred 1 $ 1 1 1  
Pre-tax gains (losses) recognized during the period in income 0 0 0 0  
Designated as Hedging Instrument | Interest Rate | Cash Flow Hedges          
Derivatives, Fair Value [Line Items]          
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred [4] 1 1 1 1  
Pre-tax gains (losses) recognized during the period in income 0 $ 0 0 $ 0  
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Natural Gas Commodity          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 0   0   9
Netting [5] 0   0   0
Derivative Asset, Net 0   0   9
Derivative Liability, Gross 0   0   6
Netting [5] 0   0   0
Derivative Liability, Net 0   0   6
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Level 1 | Natural Gas Commodity          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 0   0   0
Derivative Liability, Gross 0   0   0
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Level 2 | Natural Gas Commodity          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 0   0   9
Derivative Liability, Gross 0   0   6
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Level 3 | Natural Gas Commodity          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 0   0   0
Derivative Liability, Gross 0   0   0
Fair Value Measured on a Recurring Basis | Other Current Assets          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross [6] 4   4   11
Netting [5],[6] (3)   (3)   (1)
Derivative Asset, Net [6] 1   1   10
Fair Value Measured on a Recurring Basis | Other Current Assets | Level 1          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross [6] 2   2   2
Fair Value Measured on a Recurring Basis | Other Current Assets | Level 2          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross [6] 2   2   9
Fair Value Measured on a Recurring Basis | Other Current Assets | Level 3          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross [6] 0   0   0
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Commodity Trading          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 4   4   2
Netting [5] (3)   (3)   (1)
Derivative Asset, Net 1   1   1
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Level 1 | Commodity Trading          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 2   2   2
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Level 2 | Commodity Trading          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 2   2   0
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Level 3 | Commodity Trading          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 0   0   0
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross [6] 9   9   9
Netting [5],[6] (1)   (1)   (3)
Derivative Asset, Net [6] 8   8   6
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Level 1          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross [6] 5   5   5
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Level 2          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross [6] 4   4   4
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Level 3          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross [6] 0   0   0
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Other Derivative Instruments | Commodity Trading          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 9   9   9
Netting [5] (1)   (1)   (3)
Derivative Asset, Net 8   8   6
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Other Derivative Instruments | Level 1 | Commodity Trading          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 5   5   5
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Other Derivative Instruments | Level 2 | Commodity Trading          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 4   4   4
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Other Derivative Instruments | Level 3 | Commodity Trading          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 0   0   0
Fair Value Measured on a Recurring Basis | Other Current Liabilities          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross [6] 3   3   7
Netting [5],[6] (3)   (3)   (1)
Derivative Liability, Net [6] 0   0   6
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Level 1          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross [6] 2   2   1
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Level 2          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross [6] 1   1   6
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Level 3          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross [6] 0   0   0
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Commodity Trading          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 3   3   1
Netting [5] (3)   (3)   (1)
Derivative Liability, Net 0   0   0
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Level 1 | Commodity Trading          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 2   2   1
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Level 2 | Commodity Trading          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 1   1   0
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Level 3 | Commodity Trading          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 0   0   0
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross [6] 2   2   4
Netting [5],[6] (2)   (2)   (4)
Derivative Liability, Net [6] 0   0   0
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Level 1          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross [6] 1   1   2
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Level 2          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross [6] 1   1   2
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Level 3          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross [6] 0   0   0
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Other Derivative Instruments | Commodity Trading          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 2   2   4
Netting [5] (2)   (2)   (4)
Derivative Liability, Net 0   0   0
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Other Derivative Instruments | Level 1 | Commodity Trading          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 1   1   2
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Other Derivative Instruments | Level 2 | Commodity Trading          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 1   1   2
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Other Derivative Instruments | Level 3 | Commodity Trading          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross $ 0   $ 0   $ 0
[1] Relates primarily to option premium amortization.
[2] 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.
[3] Recorded to electric revenues. Presented amounts do not reflect non-derivative transactions or margin sharing with customers.
[4] Recorded to interest charges.
[5] PSCo nets derivative instruments and related collateral on its consolidated balance sheets when supported by a legally enforceable master netting agreement. At June 30, 2025 and Dec. 31, 2024, derivative assets and liabilities include no obligations to return cash collateral. At both June 30, 2025 and Dec. 31, 2024, derivative assets and liabilities include rights to reclaim cash collateral of $1 million. Counterparty netting amounts presented exclude settlement receivables and payables and non-derivative amounts that may be subject to the same master netting agreements.
[6] Current derivative assets are included in prepayments and other as of June 30, 2025 and Dec. 31, 2024. Total noncurrent derivative assets are included in other long-term assets as of June 30, 2025 and Dec. 31, 2024. Total current derivative liabilities are included in other current liabilities and total noncurrent derivative liabilities are included in other deferred credits and other liabilities as of June 30, 2025 and Dec. 31, 2024.