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Other Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2019
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:
 
 
2019
(Millions of Dollars)
 
Gains and
Losses on Cash Flow Hedges
 
Defined Benefit
Pension and
Postretirement
Items
 
Total
Accumulated other comprehensive loss at Jan. 1
 
$
(60
)
 
$
(64
)
 
$
(124
)
Other comprehensive loss before reclassifications (net of taxes of $(8) and $0, respectively)
 
(23
)
 
—

 
(23
)
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 $1, respectively)
 
—

 
3

(b) 
3

Net current period other comprehensive (loss) income
 
(20
)
 
3

 
(17
)
Accumulated other comprehensive loss at Dec. 31
 
$
(80
)
 
$
(61
)
 
$
(141
)

(a) 
Included in interest charges.
(b)
Included in the computation of net periodic pension and postretirement benefit costs. See Note 11 for further information.
 
 
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 (loss) income
 
(2
)
 
3

 
1

Accumulated other comprehensive loss at Dec. 31
 
$
(60
)
 
$
(64
)
 
$
(124
)
(a) 
Included in interest charges.
(b) 
Included in the computation of net periodic pension and postretirement benefit costs. See Note 11 for further information.