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Other Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Stockholders' Equity Note [Abstract] |  |
Changes in Accumulated Other Comprehensive Income (Loss), Net of Tax | Changes in accumulated other comprehensive (loss), net of tax, for the years ended Dec. 31:
|  | 2018
(Millions of Dollars) |  | Gains and Losses on Cash Flow Hedges |  | Defined Benefit Pension and Postretirement Items |  | Total
Accumulated other comprehensive loss at Jan. 1 |  | $ | (58 | ) |  | $ | (67 | ) |  | $ | (125 | )
Other comprehensive loss before reclassifications (net of taxes of $(2) and $(2), respectively) |  | (5 | ) |  | (6 | ) |  | (11 | )
Losses reclassified from net accumulated other comprehensive loss: |  |  |  |  |  |
Interest rate derivatives (net of taxes of $1 and $0, respectively) |  | 3 |  | (a) | — |  |  | 3 |
Amortization of net actuarial loss (net of taxes of $0 and $3, respectively) |  | — |  |  | 9 |  | (b) | 9 |
Net current period other comprehensive income (loss) |  | (2 | ) |  | 3 |  |  | 1 |
Accumulated other comprehensive loss at Dec. 31 |  | $ | (60 | ) |  | $ | (64 | ) |  | $ | (124 | )
|  | 2017
(Millions of Dollars) |  | Gains and Losses on Cash Flow Hedges |  | Defined Benefit Pension and Postretirement Items |  | Total
Accumulated other comprehensive loss at Jan. 1 |  | $ | (51 | ) |  | $ | (59 | ) |  | $ | (110 | )
Other comprehensive loss before reclassifications (net of taxes of $0 and $(2), respectively) |  | — |  |  | (3 | ) |  | (3 | )
Losses reclassified from net accumulated other comprehensive loss: |  |  |  |  |  |
Interest rate derivatives (net of taxes of $2 and $0, respectively) |  | 3 |  | (a) | — |  |  | 3 |
Amortization of net actuarial loss (net of taxes of $0 and $5, respectively) |  | — |  |  | 7 |  | (b) | $ | 7 |
Net current period other comprehensive income |  | 3 |  |  | 4 |  |  | 7 |
Adoption of ASU No. 2018-02 (c) |  | (10 | ) |  | (12 | ) |  | (22 | )
Accumulated other comprehensive loss at Dec. 31 |  | $ | (58 | ) |  | $ | (67 | ) |  | $ | (125 | )
(a) | Included in interest charges.
(b) | Included in the computation of net periodic pension and postretirement benefit costs.
(c) | In 2017, Xcel Energy implemented ASU No. 2018-02 related to the TCJA, which resulted in reclassification of certain credit balances within net accumulated other comprehensive loss to retained earnings.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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