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Changes in Accumulated Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 31, 2024
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
Components of comprehensive income (loss), net of tax | Changes in each component for the three months ended March 31, 2024 and 2023 were as follows:
Three Months Ended March 31, 2024 (Millions), net of tax |  | Net Unrealized Gains (Losses) on Debt Securities |  | Foreign Currency Translation Adjustment Gains (Losses), net of hedges (a) |  | Net Unrealized Pension and Other Postretirement Benefit Gains (Losses) |  | Accumulated Other Comprehensive Income (Loss)
Balances as of December 31, 2023 |  | $ | (14) |  |  | $ | (2,571) |  |  | $ | (487) |  |  | $ | (3,072) |
Net change |  | 1 |  |  | (87) |  |  | 3 |  |  | (83) |
Balances as of March 31, 2024 |  | $ | (13) |  |  | $ | (2,658) |  |  | $ | (484) |  |  | $ | (3,155) |
Three Months Ended March 31, 2023 (Millions), net of tax |  | Net Unrealized Gains (Losses) on Debt Securities |  | Foreign Currency Translation Adjustment Gains (Losses), net of hedges (a) |  | Net Unrealized Pension and Other Postretirement Benefit Gains (Losses) |  | Accumulated Other Comprehensive Income (Loss)
Balances as of December 31, 2022 |  | $ | (64) |  |  | $ | (2,622) |  |  | $ | (524) |  |  | $ | (3,210) |
Net change |  | 19 |  |  | 28 |  |  | 57 |  |  | 104 |
Balances as of March 31, 2023 |  | $ | (45) |  |  | $ | (2,594) |  |  | $ | (467) |  |  | $ | (3,106) |
(a)Refer to Note 8 for additional information on hedging activity.
AOCI income tax effect | The following table shows the tax impact for the three months ended March 31 for the changes in each component of AOCI presented above:
|  | Tax expense (benefit) |  |  |  |
|  | Three Months Ended March 31, |  |
(Millions) |  | 2024 |  | 2023 |  |  |  |
Net unrealized gains on debt securities |  | $ | 1 |  |  | $ | 6 |  |  |  |  |
Foreign currency translation adjustment, net of hedges |  | 49 |  |  | (45) |  |  |  |  |
Pension and other postretirement benefits |  | 2 |  |  | 5 |  |  |  |  |
Total tax impact |  | $ | 52 |  |  | $ | (34) |  |  |  |  |

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- Definition Tabular disclosure of components of comprehensive income (loss). Includes, but is not limited to, foreign currency translation adjustments, foreign currency transactions designated as economic hedges of a net investment in foreign entity, gain (loss) and prior service cost (credit) for pension plans and other postretirement benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Paragraph 1 -Section 45 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-1 + Details
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