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Accumulated Other Comprehensive Income (Loss) (Tables)
 3 Months Ended
Mar. 31, 2025
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Schedule of Components of Accumulated Other Comprehensive Loss in the Equity Section of the Balance Sheet
Accumulated other comprehensive income (loss) in the equity section of our consolidated balance sheet includes:

Millions of Dollars

Defined Benefit
Plans
Unrealized Holding Gain/(Loss) on
Securities
Foreign
Currency
Translation
 Unrealized Gain/(Loss) on Hedging Activities
Accumulated
Other
Comprehensive
Income/(Loss)
December 31, 2024$(390)3 (6,104)18 (6,473)
Other comprehensive income (loss)
7 2 70 — 79 
March 31, 2025$(383)5 (6,034)18 (6,394)
Schedule of Items Reclassified out of Accumulated Other Comprehensive Income (Loss)
The following table summarizes reclassifications out of accumulated other comprehensive income (loss) and into net income (loss):

Millions of Dollars

Three Months Ended
March 31

20252024
Defined benefit plans*
$7 5 
*The above amounts are included in the computation of net periodic benefit cost and are presented net of tax expense of $2 million and $2 million for the three-month periods ended March 31, 2025 and March 31, 2024, respectively. See Note 14.