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Changes in Accumulated Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 31, 2022
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, 2022 and 2021 were as follows:
Three Months Ended March 31, 2022 (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, 2021 |  | $ | 23 |  |  | $ | (2,392) |  |  | $ | (576) |  |  | $ | (2,945) |
Net change |  | (28) |  |  | (20) |  |  | 20 |  |  | (28) |
Balances as of March 31, 2022 |  | $ | (5) |  |  | $ | (2,412) |  |  | $ | (556) |  |  | $ | (2,973) |
Three Months Ended March 31, 2021 (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, 2020 |  | $ | 65 |  |  | $ | (2,229) |  |  | $ | (731) |  |  | $ | (2,895) |
Net change |  | (12) |  |  | (17) |  |  | 26 |  |  | (3) |
Balances as of March 31, 2021 |  | $ | 53 |  |  | $ | (2,246) |  |  | $ | (705) |  |  | $ | (2,898) |
(a)Refer to Note 8 for additional information on hedging activity. 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) |  | 2022 |  | 2021 |  |  |  |
Net unrealized (losses) gains on debt securities |  | $ | (9) |  |  | $ | (3) |  |  |  |  |
Foreign currency translation adjustment, net of hedges |  | (30) |  |  | 8 |  |  |  |  |
Pension and other postretirement benefits |  | 7 |  |  | 11 |  |  |  |  |
Total tax impact |  | $ | (32) |  |  | $ | 16 |  |  |  |  |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124509347&loc=d3e526-108580 + Details
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