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Benefit Plans and Other Postretirement Benefits (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
Jan. 31, 2023 | Mar. 31, 2023 | Mar. 31, 2022
Components of Net Periodic Benefit Cost [Abstract] |  |  |  |
Operating and maintenance expenses |  |  | $ 650 | $ 602
Pension Plan [Member] |  |  |  |
Components of Net Periodic Benefit Cost [Abstract] |  |  |  |
Service cost |  |  | 18 | 24
Interest Cost | [1] |  | 40 | 27
Expected Return on Plan Assets | [1] |  | (52) | (52)
Amortization of Prior Service Credit | [1] |  | 0 | 0
Amortization of Net Loss | [1] |  | 5 | 19
Net periodic benefit cost (credit) |  |  | 11 | 17
Effects of regulation |  |  | 5 | 5
Net benefit cost (credit) recognized for financial reporting |  |  | 16 | 22
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement | [2] |  | 0 | (1)
Operating and maintenance expenses |  |  | 1 |
Pension Plan [Member] | Parent Company |  |  |  |
Components of Net Periodic Benefit Cost [Abstract] |  |  |  |
Contributions to Xcel Energy's pension plans |  | $ 50 |  |
Other Postretirement Benefits Plan [Member] |  |  |  |
Components of Net Periodic Benefit Cost [Abstract] |  |  |  |
Service cost |  |  | 0 | 0
Interest Cost | [1] |  | 5 | 4
Expected Return on Plan Assets | [1] |  | (4) | (4)
Amortization of Prior Service Credit | [1] |  | 0 | (2)
Amortization of Net Loss | [1] |  | 1 | 1
Net periodic benefit cost (credit) |  |  | 2 | (1)
Effects of regulation |  |  | 0 | 1
Net benefit cost (credit) recognized for financial reporting |  |  | 2 | 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement | [2] |  | $ 0 | $ 0
[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
[2] | In the first quarter of 2022, Xcel Energy recognized $1 million in settlement charge true-ups related to the fourth quarter of 2021

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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123453770&loc=SL108413299-114919 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(3) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 + Details
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