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Other Comprehensive Income (Loss)
 6 Months Ended
Jun. 30, 2020
Stockholders' Equity Note [Abstract]  
Other Comprehensive Income (Loss)
Changes in accumulated other comprehensive loss, net of tax, for the three and six months ended June 30, 2020 and 2019:
Three Months Ended June 30, 2020Three Months Ended June 30, 2019
(Millions of Dollars)Gains and Losses
on Cash Flow Hedges		Defined Benefit Pension and
Postretirement Items		TotalGains and Losses
on Cash Flow Hedges		Defined Benefit Pension and
Postretirement Items		Total
Accumulated other comprehensive loss at April 1$(88) $(60) $(148) $(66) $(61) $(127) 
Other comprehensive (loss) gain before reclassifications (net of taxes of $—, $—, $(3) and $—, respectively)
—  —  —  (10) 1  (9) 
Losses reclassified from net accumulated other comprehensive loss:
Interest rate derivatives (net of taxes of $1, $—, $— and $—, respectively) (a)
1  —  1  1  —  1  
Amortization of net actuarial loss (net of taxes of $—, $1, $— and $—, respectively) (b)
—  2  2  —  —  —  
Net current period other comprehensive income (loss)1  2  3  (9) 1  (8) 
Accumulated other comprehensive loss at June 30$(87) $(58) $(145) $(75) $(60) $(135) 
Six Months Ended June 30, 2020Six Months Ended June 30, 2019
(Millions of Dollars)Gains and Losses
on Cash Flow Hedges		Defined Benefit Pension and
Postretirement Items		TotalGains and Losses
on Cash Flow Hedges		Defined Benefit Pension and
Postretirement Items		Total
Accumulated other comprehensive loss at Jan. 1$(80) $(61) $(141) $(60) $(64) $(124) 
Other comprehensive (loss) gain before reclassifications (net of taxes of $(3), $—, $(5) and $1, respectively)
(10) —  (10) (17) 3  (14) 
Losses reclassified from net accumulated other comprehensive loss:
Interest rate derivatives (net of taxes of $1, $—, $— and $—, respectively) (a)
3  —  3  2  —  2  
Amortization of net actuarial loss (net of taxes of $—, $1, $— and $—, respectively) (b)
—  3  3  —  1  1  
Net current period other comprehensive (loss) income(7) 3  (4) (15) 4  (11) 
Accumulated other comprehensive loss at June 30$(87) $(58) $(145) $(75) $(60) $(135) 
(a)Included in interest charges.
(b)Included in the computation of net periodic pension and postretirement benefit costs.