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Other Comprehensive Income (Tables)
 12 Months Ended
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.