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Changes in Accumulated Other Comprehensive Income (Tables) | 3 Months Ended
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Mar. 31, 2020
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, 2020 and 2019 were as follows:
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 (Loss) Income
Balances as of December 31, 2019 |  | $ | 33 |  |  | $ | (2,189) |  |  | $ | (581) |  |  | $ | (2,737) |
Net unrealized gains |  | 57 |  |  | — |  |  | — |  |  | 57 |
Net translation losses on investments in foreign operations |  | — |  |  | (1,054) |  |  | — |  |  | (1,054) |
Net gains related to 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) |
Three Months Ended March 31, 2019 (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 (Loss) Income
Balances as of December 31, 2018 |  | $ | (8) |  |  | $ | (2,133) |  |  | $ | (456) |  |  | $ | (2,597) |
Net unrealized gains |  | 17 |  |  | — |  |  | — |  |  | 17 |
Net translation gains on investments in foreign operations |  | — |  |  | 170 |  |  | — |  |  | 170 |
Net losses related to hedges of investments in foreign operations |  | — |  |  | (162) |  |  | — |  |  | (162) |
Pension and other postretirement benefits |  | — |  |  | — |  |  | (27) |  |  | (27) |
Net change in accumulated other comprehensive income (loss) |  | 17 |  |  | 8 |  |  | (27) |  |  | (2) |
Balances as of March 31, 2019 |  | $ | 9 |  |  | $ | (2,125) |  |  | $ | (483) |  |  | $ | (2,599) |
Accumulated Other Comprehensive Loss 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) | 2020 |  | 2019 |  |  |  |
Net unrealized debt securities | $ | 18 |  |  | $ | 4 |  |  |  |  |
Net translation on investments in foreign operations | 30 |  |  | 14 |  |  |  |  |
Net hedges on investments in foreign operations | 230 |  |  | (50) |  |  |  |  |
Pension and other postretirement benefits | 12 |  |  | (11) |  |  |  |  |
Total tax impact | $ | 290 |  |  | $ | (43) |  |  |  |  |

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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=118930883&loc=d3e526-108580 + Details
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