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Accumulated Other Comprehensive Income (Loss)
 9 Months Ended
Sep. 30, 2024
Equity [Abstract]  
Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Income (Loss)
The following table shows the changes in accumulated other comprehensive income (loss) by component. Amounts in parentheses indicate debits.
(Millions of dollars)Pension BenefitsOther BenefitsOtherTotal
Balance as of December 31, 2022$(163)$165 $— $2 
Other comprehensive gain (loss) before reclassifications, net of tax of $(2)
(9)3 (2)(8)
Amounts reclassified from accumulated other comprehensive loss:
Amortization of prior service credit(a)
(34)(16)— (50)
 Amortization of actuarial gain(a)
(4)— — (4)
Settlement gain(a)
(2)— — (2)
Other— — (1)(1)
Tax effect10 4 — 14 
Other comprehensive loss(39)(9)(3)(51)
Balance as of September 30, 2023$(202)$156 $(3)$(49)

(Millions of dollars)Pension BenefitsOther BenefitsOtherTotal
Balance as of December 31, 2023$(261)$129 $1 $(131)
Other comprehensive gain (loss) before reclassifications, net of tax of $1
2 (1)(1)— 
Amounts reclassified from accumulated other comprehensive loss:
Amortization of prior service credit(a)
(25)(16)— (41)
 Amortization of actuarial loss(a)
5 — — 5 
Tax effect5 4 — 9 
Other comprehensive loss(13)(13)(1)(27)
Balance as of September 30, 2024$(274)$116 $— $(158)
(a)These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost. See Note 22.