v3.26.1
Benefit Plans and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended
Jan. 31, 2026
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Pension Plan [Member]          
Components of Net Periodic Benefit Cost [Abstract]          
Service cost   $ 20 $ 19 $ 40 $ 38
Interest Cost [1]   39 39 78 78
Expected Return on Plan Assets [1]   (50) (52) (100) (104)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) [1]   (1) 0 (1) 0
Amortization of Net Loss [1]   11 7 22 14
Net periodic benefit cost   19 13 39 26
Effects of regulation   0 2 (1) 4
Net benefit cost recognized for financial reporting   19 15 38 30
Pension Plan [Member] | Parent Company          
Components of Net Periodic Benefit Cost [Abstract]          
Contributions to Xcel Energy's pension plans $ 75        
Other Postretirement Benefits Plan [Member]          
Components of Net Periodic Benefit Cost [Abstract]          
Service cost   1 0 1 0
Interest Cost [1]   6 6 12 12
Expected Return on Plan Assets [1]   (5) (5) (10) (10)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) [1]   0 0 0 0
Amortization of Net Loss [1]   1 1 2 2
Net periodic benefit cost   3 2 5 4
Effects of regulation   0 0 0 0
Net benefit cost recognized for financial reporting   $ 3 $ 2 $ 5 $ 4
[1] The components of net periodic cost other than the service cost component are included in the line item “Other income, net” in the consolidated statements of income or capitalized on the consolidated balance sheets as a regulatory asset.