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Benefit Plans and Other Postretirement Benefits, Pension Plan Benefit Obligations, Cash Flows and Benefit Costs (Details)
$ in Millions
1 Months Ended 12 Months Ended
Jan. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Plan
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Defined Benefit Plan Disclosure [Line Items]          
Postretirement Cash Balance Formula       5.00%  
Components of Net Periodic Benefit Cost (Credit) [Abstract]          
Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses     $ 811.0 $ 810.0 $ 788.0
Significant Assumptions Used to Measure Costs [Abstract]          
Liability, Defined Benefit Plan, Noncurrent     161.0 212.0  
Other Pension, Postretirement and Supplemental Plans [Member]          
Change in Projected Benefit Obligation [Roll Forward]          
Obligation at Jan. 1 $ 3.0 $ 3.0      
Obligation at Dec. 31     3.0    
Other Pension, Postretirement and Supplemental Plans [Member] | Xcel Energy Inc.          
Change in Projected Benefit Obligation [Roll Forward]          
Obligation at Jan. 1 43.0 43.0 39.0    
Obligation at Dec. 31     43.0 39.0  
Components of Net Periodic Benefit Cost (Credit) [Abstract]          
Net benefit cost recognized for financial reporting     6.0 4.0  
Pension Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Accumulated Benefit Obligation at Dec. 31     1,353.0 1,267.0  
Change in Projected Benefit Obligation [Roll Forward]          
Obligation at Jan. 1 1,428.0 1,428.0 1,330.0    
Service cost     30.0 26.0 29.0
Interest cost     46.0 52.0 47.0
Plan amendments     0.0 0.0  
Actuarial (gain) loss     102.0 108.0  
Benefit payments     (80.0) (85.0)  
Obligation at Dec. 31     1,428.0 1,330.0  
Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of plan assets at Jan. 1 1,283.0 $ 1,283.0 1,124.0    
Actual return (loss) on plan assets     189.0 197.0  
Employer contributions     50.0 46.0  
Plan participants' contributions     0.0 0.0  
Benefit payments     (80.0) (85.0)  
Fair value of plan assets at Dec. 31     1,283.0 1,124.0  
Funded Status of Plans at Dec. 31 [Abstract]          
Funded status     145.0 206.0  
Amounts Not Yet Recognized as Components of Net Periodic Benefit Cost [Abstract]          
Net loss     432.0 482.0  
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax     (1.0) (4.0)  
Total     431.0 478.0  
Amounts Not Yet Recognized as Components of Net Periodic Benefit Cost Have Been Recorded as Follows Based Upon Expected Recovery in Rates [Abstract]          
Current regulatory assets     25.0 22.0  
Noncurrent regulatory assets     404.0 452.0  
Deferred income taxes     1.0 1.0  
Net-of-tax accumulated OCI     1.0 3.0  
Total     $ 431.0 $ 478.0  
Significant Assumptions Used to Measure Benefit Obligations [Abstract]          
Discount rate for year-end valuation (as a percent)     2.71% 3.49%  
Expected average long-term increase in compensation level (as a percent)     3.75% 3.75%  
Components of Net Periodic Benefit Cost (Credit) [Abstract]          
Service cost     $ 30.0 $ 26.0 29.0
Interest cost     46.0 52.0 47.0
Expected return on plan assets     (70.0) (69.0) (69.0)
Amortization of prior service (credit) cost     (3.0) (3.0) (3.0)
Amortization of net loss     30.0 25.0 31.0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement     0.0 (3.0) (5.0)
Net periodic pension cost     33.0 34.0 40.0
Defined Benefit Plan, Costs Not Recognized Due To Regulation     4.0 4.0 (4.0)
Net benefit cost recognized for financial reporting     $ 37.0 $ 38.0 $ 36.0
Significant Assumptions Used to Measure Costs [Abstract]          
Discount rate (as a percent)     3.49% 4.31% 3.63%
Expected average long-term increase in compensation level (as a percent)     3.75% 3.75% 3.75%
Expected average long-term rate of return on assets (as a percent)     6.84% 6.84% 6.84%
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant     $ 0.0 $ 0.0  
Medicare subsidy reimbursements     0.0 0.0  
Liability, Defined Benefit Plan, Noncurrent     145.0 206.0  
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position     (145.0) (206.0)  
Pension Plan [Member] | PSCo [Member]          
Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of plan assets at Jan. 1     1,124.0    
Fair value of plan assets at Dec. 31       1,124.0  
Cash Flows [Abstract]          
Total contributions to Xcel Energy's pension plans during the period     $ 50.0 46.0 $ 22.0
Components of Net Periodic Benefit Cost (Credit) [Abstract]          
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement       $ (3.0) $ (5.0)
Pension Plan [Member] | Xcel Energy Inc.          
Cash Flows [Abstract]          
Number of pension plans to which contributions were made | Plan     4    
Pension Plan [Member] | Subsequent Event          
Significant Assumptions Used to Measure Costs [Abstract]          
Expected average long-term rate of return on assets for next fiscal year (as a percent)   6.38%      
Pension Plan [Member] | Subsequent Event | PSCo [Member]          
Cash Flows [Abstract]          
Total contributions to Xcel Energy's pension plans during the period $ 45.0