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Accumulated Other Comprehensive Loss	9 Months Ended
Accumulated Other Comprehensive Loss	Sep. 30, 2021
Accumulated Other Comprehensive Loss [Abstract]
Accumulated Other Comprehensive Loss	Note 13—Accumulated Other Comprehensive Loss Accumulated other comprehensive loss in the equity section of our consolidated balance sheet included: Millions of Dollars Defined Benefit Plans Net Unrealized Gain (Loss) on Securities Foreign Currency Translation Accumulated Other Comprehensive Loss December 31, 2020 $ (425) 2 (4,795) (5,218) Other comprehensive income (loss) 169 (1) (73) 95 September 30, 2021 $ (256) 1 (4,868) (5,123) The following table summarizes reclassifications out of accumulated other comprehensive loss and into net income (loss): Millions of Dollars Three Months Ended Nine Months Ended September 30 September 30 2021 2020 2021 2020 Defined benefit plans $ 29 30 83 46 The above amounts are included in the computation of net periodic benefit cost and are presented net of tax expense of $ 7 million and $ 7 million for the three-month periods ended September 30, 2021 and September 30, 2020, respectively, and $ 22 million and $ 11 million for the nine-month periods ended September 30, 2021 and September 30, 2020, respectively .