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Other Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 30, 2024
Stockholders' Equity Note [Abstract]  
Changes in Accumulated Other Comprehensive Income (Loss), Net of Tax
Changes in accumulated other comprehensive loss, net of tax:
Three Months Ended Sept. 30, 2024Three Months Ended Sept. 30, 2023
(Millions of Dollars)Gains and Losses on Cash Flow HedgesDefined Benefit Pension and Postretirement ItemsTotalGains and Losses on Cash Flow HedgesDefined Benefit Pension and Postretirement ItemsTotal
Accumulated other comprehensive loss at July 1$(30)$(37)$(67)$(44)$(38)$(82)
Other comprehensive gain before reclassifications
— — — 3 — 3 
Losses reclassified from net accumulated other comprehensive loss:
Interest rate derivatives (a)
1 — 1 1 — 1 
Net current period other comprehensive income1 — 1 4 — 4 
Accumulated other comprehensive loss at Sept. 30$(29)$(37)$(66)$(40)$(38)$(78)
Nine Months Ended Sept. 30, 2024Nine Months Ended Sept. 30, 2023
(Millions of Dollars)Gains and Losses on Cash Flow HedgesDefined Benefit Pension and Postretirement ItemsTotalGains and Losses on Cash Flow HedgesDefined Benefit Pension and Postretirement ItemsTotal
Accumulated other comprehensive loss at Jan. 1$(53)$(41)$(94)$(54)$(39)$(93)
Other comprehensive gain before reclassifications
22 — 22 11 — 11 
Losses reclassified from net accumulated other comprehensive loss:
Interest rate derivatives (a)
2 — 2 3 — 3 
Amortization of net actuarial losses (b)
— 4 4 — 1 1 
Net current period other comprehensive income24 4 28 14 1 15 
Accumulated other comprehensive loss at Sept. 30$(29)$(37)$(66)$(40)$(38)$(78)
(a)Included in interest charges.
(b)Included in the computation of net periodic pension and postretirement benefit costs. See Note 9 for further information.