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Changes in Accumulated Other Comprehensive Income (Loss) | 3 Months Ended
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Mar. 31, 2021
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
Changes In Accumulated Other Comprehensive Income (Loss) | Changes In Accumulated Other Comprehensive Income (Loss) AOCI is comprised of items that have not been recognized in earnings but may be recognized in earnings in the future when certain events occur. Changes in each component for the three months ended March 31, 2021 and 2020 were as follows:
Three Months Ended March 31, 2021 (Millions), net of tax |  | Net Unrealized Gains (Losses) on Debt Securities |  | Foreign Currency Translation Adjustment Gains (Losses) |  | 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 unrealized losses |  | (12) |  |  | — |  |  | — |  |  | (12) |
Net translation on investments in foreign operations |  | — |  |  | (23) |  |  | — |  |  | (23) |
Net hedges of investments in foreign operations |  | — |  |  | 6 |  |  | — |  |  | 6 |
Pension and other postretirement benefits |  | — |  |  | — |  |  | 26 |  |  | 26 |
Net change in accumulated other comprehensive income (loss) |  | (12) |  |  | (17) |  |  | 26 |  |  | (3) |
Balances as of March 31, 2021 |  | $ | 53 |  |  | $ | (2,246) |  |  | $ | (705) |  |  | $ | (2,898) |
Three Months Ended March 31, 2020 (Millions), net of tax |  | Net Unrealized Gains (Losses) on Debt Securities |  | Foreign Currency Translation Adjustment Gains (Losses) |  | Net Unrealized Pension and Other Postretirement Benefit Gains (Losses) |  | Accumulated Other Comprehensive Income (Loss)
Balances as of December 31, 2019 |  | $ | 33 |  |  | $ | (2,189) |  |  | $ | (581) |  |  | $ | (2,737) |
Net unrealized gains |  | 57 |  |  | — |  |  | — |  |  | 57 |
Net translation on investments in foreign operations |  | — |  |  | (1,054) |  |  | — |  |  | (1,054) |
Net hedges of investments in foreign operations |  | — |  |  | 732 |  |  | — |  |  | 732 |
Pension and other postretirement benefits |  | — |  |  | — |  |  | 6 |  |  | 6 |
Net change in accumulated other comprehensive income (loss) |  | 57 |  |  | (322) |  |  | 6 |  |  | (259) |
Balances as of March 31, 2020 |  | $ | 90 |  |  | $ | (2,511) |  |  | $ | (575) |  |  | $ | (2,996) |
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) | 2021 |  | 2020 |  |  |  |
Net unrealized (losses) gains on debt securities | $ | (3) |  |  | $ | 18 |  |  |  |  |
Net translation on investments in foreign operations | 8 |  |  | 30 |  |  |  |  |
Net hedges of investments in foreign operations | — |  |  | 230 |  |  |  |  |
Pension and other postretirement benefits | 11 |  |  | 12 |  |  |  |  |
Total tax impact | $ | 16 |  |  | $ | 290 |  |  |  |  |
Reclassifications out of AOCI into the Consolidated Statements of Income for the three months ended March 31, 2021 and 2020 were not significant.

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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