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Changes in Accumulated Other Comprehensive Income (Tables) | 6 Months Ended
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Jun. 30, 2019
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 and six months ended June 30, 2019 and 2018 were as follows:
Three Months Ended June 30, 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 March 31, 2019 |  | $ | 9 |  |  | $ | (2,125 | ) |  | $ | (483 | ) |  | $ | (2,599 | )
Net unrealized gains |  | 26 |  |  | — |  |  | — |  |  | 26 |
Net translation losses on investments in foreign operations |  | — |  |  | (123 | ) |  | — |  |  | (123 | )
Net gains related to hedges of investments in foreign operations |  | — |  |  | 87 |  |  | — |  |  | 87 |
Pension and other postretirement benefits |  | — |  |  | — |  |  | 3 |  |  | 3 |
Net change in accumulated other comprehensive income (loss) |  | 26 |  |  | (36 | ) |  | 3 |  |  | (7 | )
Balances as of June 30, 2019 |  | $ | 35 |  |  | $ | (2,161 | ) |  | $ | (480 | ) |  | $ | (2,606 | )
Six Months Ended June 30, 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 |  | 43 |  |  | — |  |  | — |  |  | 43 |
Net translation gains on investments in foreign operations |  | — |  |  | 47 |  |  | — |  |  | 47 |
Net losses related to hedges of investments in foreign operations |  | — |  |  | (75 | ) |  | — |  |  | (75 | )
Pension and other postretirement benefits |  | — |  |  | — |  |  | (24 | ) |  | (24 | )
Net change in accumulated other comprehensive income (loss) |  | 43 |  |  | (28 | ) |  | (24 | ) |  | (9 | )
Balances as of June 30, 2019 |  | $ | 35 |  |  | $ | (2,161 | ) |  | $ | (480 | ) |  | $ | (2,606 | )
Three Months Ended June 30, 2018 (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 March 31, 2018 |  | $ | (11 | ) |  | $ | (1,931 | ) |  | $ | (439 | ) |  | $ | (2,381 | )
Net unrealized losses |  | (7 | ) |  | — |  |  | — |  |  | (7 | )
Net translation losses on investments in foreign operations |  | — |  |  | (416 | ) |  | — |  |  | (416 | )
Net gains related to hedges of investments in foreign operations |  | — |  |  | 320 |  |  | — |  |  | 320 |
Pension and other postretirement benefits |  | — |  |  | — |  |  | 1 |  |  | 1 |
Net change in accumulated other comprehensive (loss) income |  | (7 | ) |  | (96 | ) |  | 1 |  |  | (102 | )
Balances as of June 30, 2018 |  | $ | (18 | ) |  | $ | (2,027 | ) |  | $ | (438 | ) |  | $ | (2,483 | )
Six Months Ended June 30, 2018 (Millions), net of tax |  | Net Unrealized Gains (Losses) on Investment 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, 2017 |  | $ | — |  |  | $ | (1,961 | ) |  | $ | (467 | ) |  | $ | (2,428 | )
Net unrealized losses |  | (20 | ) |  | — |  |  | — |  |  | (20 | )
Net translation losses on investments in foreign operations |  | — |  |  | (224 | ) |  | — |  |  | (224 | )
Net gains related to hedges of investments in foreign operations |  | — |  |  | 158 |  |  | — |  |  | 158 |
Pension and other postretirement benefits |  | — |  |  | — |  |  | 29 |  |  | 29 |
Other(a) |  | 2 |  |  | — |  |  | — |  |  | 2 |
Net change in accumulated other comprehensive (loss) income |  | (18 | ) |  | (66 | ) |  | 29 |  |  | (55 | )
Balances as of June 30, 2018 |  | $ | (18 | ) |  | $ | (2,027 | ) |  | $ | (438 | ) |  | $ | (2,483 | )
(a) Represents unrealized gains pertaining to equity securities moved from AOCI to retained earnings as of January 1, 2018, due to the prospective adoption of the financial instruments guidance effective January 1, 2018.
Accumulated Other Comprehensive Loss Income - Tax Effect | The following table shows the tax impact for the three and six months ended June 30 for the changes in each component of AOCI presented above:
| Tax expense (benefit)
| Three Months Ended June 30, |  | Six Months Ended June 30,
(Millions) | 2019 |  | 2018 |  | 2019 |  |  | 2018 |
Net unrealized investment securities | $ | 9 |  |  | $ | (2 | ) |  | $ | 13 |  |  | $ | (5 | )
Net translation on investments in foreign operations | 1 |  |  | (70 | ) |  | 15 |  |  | (68 | )
Net hedges on investments in foreign operations | 28 |  |  | 107 |  |  | (22 | ) |  | 53 |
Pension and other postretirement benefits | 4 |  |  | 6 |  |  | (7 | ) |  | 9 |
Total tax impact | $ | 42 |  |  | $ | 41 |  |  | $ | (1 | ) |  | $ | (11 | )

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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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