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Other Comprehensive Income
 3 Months Ended
Mar. 31, 2020
Stockholders' Equity Note [Abstract]  
Other Comprehensive Income
Changes in accumulated other comprehensive loss, net of tax, for the three months ended March 31, 2020 and 2019:
 
 
Three Months Ended March 31, 2020
(Millions of Dollars)
 
Gains and Losses
on Cash Flow Hedges
 
Defined Benefit Pension and
Postretirement Items
 
Total
Accumulated other comprehensive loss at Jan. 1
 
$
(80
)
 
$
(61
)
 
$
(141
)
Other comprehensive loss before reclassifications (net of taxes of $(3) and $0, respectively)
 
(10
)
 
—

 
(10
)
Losses reclassified from net accumulated other comprehensive loss:
 
 
 
 
 
 
Interest rate derivatives (net of taxes of $0) (a)
 
2

 
—

 
2

Amortization of net actuarial loss (net of taxes of $0) (b)
 
—

 
1

 
1

Net current period other comprehensive (loss) income
 
(8
)
 
1

 
(7
)
Accumulated other comprehensive loss at March 31
 
$
(88
)
 
$
(60
)
 
$
(148
)

(a) 
Included in interest charges.
(b) 
Included in the computation of net periodic pension and postretirement benefit costs.
 
 
Three Months Ended March 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) gain before reclassifications (net of taxes of $(2) and $1, respectively)
 
(7
)
 
2

 
(5
)
Losses reclassified from net accumulated other comprehensive loss:
 
 
 
 
 
 
Interest rate derivatives (net of taxes of $0) (a)
 
1

 
—

 
1

Amortization of net actuarial loss (net of taxes of $0) (b)
 
—

 
1

 
1

Net current period other comprehensive (loss) income
 
(6
)
 
3

 
(3
)
Accumulated other comprehensive loss at March 31
 
$
(66
)
 
$
(61
)
 
$
(127
)
(a) 
Included in interest charges.
(b) 
Included in the computation of net periodic pension and postretirement benefit costs.