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Summarized Quarterly Financial Data (Unaudited) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Information [Text Block] | Summarized Quarterly Financial Data (Unaudited)
|  | Quarter Ended
(Amounts in millions, except per share data) |  | March 31, 2018 |  | June 30, 2018 |  | Sept. 30, 2018 |  | Dec. 31, 2018
Operating revenues |  | $ | 2,951 |  |  | $ | 2,658 |  |  | $ | 3,048 |  |  | $ | 2,880 |
Operating income (a) |  | 480 |  |  | 450 |  |  | 696 |  |  | 339 |
Net income |  | 291 |  |  | 265 |  |  | 491 |  |  | 214 |
EPS total — basic |  | $ | 0.57 |  |  | $ | 0.52 |  |  | $ | 0.96 |  |  | $ | 0.42 |
EPS total — diluted |  | 0.57 |  |  | 0.52 |  |  | 0.96 |  |  | 0.42 |
Cash dividends declared per common share |  | 0.38 |  |  | 0.38 |  |  | 0.38 |  |  | 0.38 |
|  | Quarter Ended
(Amounts in millions, except per share data) |  | March 31, 2017 |  | June 30, 2017 |  | Sept. 30, 2017 |  | Dec. 31, 2017
Operating revenues |  | $ | 2,946 |  |  | $ | 2,645 |  |  | $ | 3,017 |  |  | $ | 2,796 |
Operating income (a) |  | 492 |  |  | 466 |  |  | 824 |  |  | 440 |
Net income |  | 239 |  |  | 227 |  |  | 492 |  |  | 189 |
EPS total — basic |  | $ | 0.47 |  |  | $ | 0.45 |  |  | $ | 0.97 |  |  | $ | 0.37 |
EPS total — diluted |  | 0.47 |  |  | 0.45 |  |  | 0.97 |  |  | 0.37 |
Cash dividends declared per common share |  | 0.36 |  |  | 0.36 |  |  | 0.36 |  |  | 0.36 |
(a) | In 2018, Xcel Energy implemented ASU No. 2017-07 related to net periodic benefit cost, which resulted in retrospective reclassification of pension costs from O&M expense to other income.

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- References No definition available. + Details
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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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