| Cover Page | May 07, 2020 |
| Document Information [Line Items] | |
| Amendment Flag | false |
| Entity Registrant Name | XCEL ENERGY INC |
| Entity Central Index Key | 0000072903 |
| Entity Incorporation, State or Country Code | MN |
| Document Type | 8-K |
| Document Period End Date | May 7, 2020 |
| Entity File Number | 001-3034 |
| Entity Tax Identification Number | 41-0448030 |
| Entity Address, Address Line One | 414 Nicollet Mall |
| Entity Address, City or Town | Minneapolis |
| Entity Address, State or Province | MN |
| Entity Address, Postal Zip Code | 55401 |
| City Area Code | (612) |
| Local Phone Number | 330-5500 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Title of 12(b) Security | Common Stock |
| Trading Symbol | XEL |
| Security Exchange Name | NASDAQ |
| NSPM | |
| Document Information [Line Items] | |
| Entity Registrant Name | NORTHERN STATES POWER CO |
| Entity Central Index Key | 0001123852 |
| Entity Incorporation, State or Country Code | MN |
| Entity File Number | 000-31387 |
| Entity Tax Identification Number | 41-1967505 |
| Entity Address, Address Line One | 414 Nicollet Mall |
| Entity Address, City or Town | Minneapolis |
| Entity Address, State or Province | MN |
| Entity Address, Postal Zip Code | 55401 |
| City Area Code | (612) |
| Local Phone Number | 330-5500 |
| NSPW | |
| Document Information [Line Items] | |
| Entity Registrant Name | NORTHERN STATES POWER CO /WI/ |
| Entity Central Index Key | 0000072909 |
| Entity Incorporation, State or Country Code | WI |
| Entity File Number | 001-03140 |
| Entity Tax Identification Number | 39-0508315 |
| Entity Address, Address Line One | 1414 W. Hamilton Avenue |
| Entity Address, City or Town | Eau Claire |
| Entity Address, State or Province | WI |
| Entity Address, Postal Zip Code | 54701 |
| City Area Code | (715) |
| Local Phone Number | 737-2625 |
| PSCo | |
| Document Information [Line Items] | |
| Entity Registrant Name | PUBLIC SERVICE CO OF COLORADO |
| Entity Central Index Key | 0000081018 |
| Entity Incorporation, State or Country Code | CO |
| Entity File Number | 001-3280 |
| Entity Tax Identification Number | 84-0296600 |
| Entity Address, Address Line One | 1800 Larimer, Suite 1100 |
| Entity Address, City or Town | Denver |
| Entity Address, State or Province | CO |
| Entity Address, Postal Zip Code | 80202 |
| City Area Code | (303) |
| Local Phone Number | 571-7511 |
| SPS | |
| Document Information [Line Items] | |
| Entity Registrant Name | SOUTHWESTERN PUBLIC SERVICE CO |
| Entity Central Index Key | 0000092521 |
| Entity Incorporation, State or Country Code | NM |
| Entity File Number | 001-03789 |
| Entity Tax Identification Number | 75-0575400 |
| Entity Address, Address Line One | 790 South Buchanan |
| Entity Address, City or Town | Amarillo |
| Entity Address, State or Province | TX |
| Entity Address, Postal Zip Code | 79101 |
| City Area Code | (303) |
| Local Phone Number | 571-7511 |
