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Condensed Statements of Income and Comprehensive Income (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income      
Income (Loss) from Equity Method Investments $ 35 $ 36 $ 62
Expenses and other deductions      
Other income (22) 13 (5)
Interest charges and financing costs 1,055 953 842
Income before income taxes 1,625 1,601 1,527
Income tax benefit (146) (135) (70)
Net income 1,771 1,736 1,597
Other Comprehensive Income (Loss), Net of Tax [Abstract]      
Total comprehensive income $ 1,770 $ 1,766 $ 1,615
Weighted average common shares outstanding:      
Basic 552 547 539
Diluted 552 547 540
Earnings per average common share:      
Basic $ 3.21 $ 3.18 $ 2.96
Diluted $ 3.21 $ 3.17 $ 2.96
Xcel Energy Inc.      
Income      
Income (Loss) from Equity Method Investments $ 1,948 $ 1,905 $ 1,744
Total income 1,948 1,905 1,744
Expenses and other deductions      
Operating expenses 25 19 21
Other income 13 2 (3)
Interest charges and financing costs 235 206 173
Total expenses and other deductions 247 223 197
Income before income taxes 1,701 1,682 1,547
Income tax benefit (70) (54) (50)
Net income 1,771 1,736 1,597
Other Comprehensive Income (Loss), Net of Tax [Abstract]      
Net pension and retiree medical (losses) gains arising during the period, net of tax (2) 9 8
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax 1 21 10
Other Comprehensive Income (Loss), Net of Tax (1) 30 18
Total comprehensive income $ 1,770 $ 1,766 $ 1,615