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Schedule II, Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2018
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
Schedule II, Valuation and Qualifying Accounts | XCEL ENERGY INC. AND SUBSIDIARIES VALUATION AND QUALIFYING ACCOUNTS YEARS ENDED DEC. 31
| Allowance for bad debts |  | NOL and tax credit valuation allowances
(Millions of Dollars) | 2018 |  | 2017 |  | 2016 |  | 2018 |  | 2017 |  | 2016 |
Balance at Jan. 1 | $ | 52 |  |  | $ | 51 |  |  | $ | 52 |  |  | $ | 77 |  |  | $ | 58 |  |  | $ | 28 |  |
Additions Charged to Costs and Expenses | 42 |  |  | 39 |  |  | 39 |  |  | 7 |  |  | 9 |  |  | 3 |  |
Additions Charged to Other Accounts | 11 |  |  | 10 |  |  | 11 |  |  | — |  | (a) | 22 |  | (a) | 35 |  | (a)
Deductions from Reserves | (50 | ) |  | (48 | ) |  | (51 | ) |  | (5 | ) | (b) | (12 | ) | (b) | (8 | ) | (b)
Balance at Dec. 31 | $ | 55 |  |  | $ | 52 |  |  | $ | 51 |  |  | $ | 79 |  |  | $ | 77 |  |  | $ | 58 |  |
(a) | The 2016 - 2017 changes are the accrual of valuation allowances for North Dakota ITC, net of federal income tax benefit, that is offset to a regulatory liability; the 2017 change includes $14 million expense related to the revaluation of federal benefit as a result of the TCJA.
(b) | Primarily the reductions to valuation allowances for North Dakota ITC carryforwards, net of federal benefit, primarily due to a consolidated adjustment to the regulatory liability accrual referenced above; the 2017 change includes $4 million of reduced expense related to the revaluation of federal benefit as a result of TCJA.

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- References No definition available. + Details
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