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Changes in Accumulated Other Comprehensive (Loss) Income (Tables) | 9 Months Ended
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Sep. 30, 2018
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
Components of comprehensive income (loss), net of tax | 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 and nine months ended September 30, 2018 and 2017 were as follows:
Three Months Ended September 30, 2018 (Millions), net of tax |  | Net Unrealized Losses on Debt Securities |  | Foreign Currency Translation Adjustments |  | Net Unrealized Pension and Other Postretirement Benefit (Losses) Gains |  | Accumulated Other Comprehensive (Loss) Income
Balances as of June 30, 2018 |  | $ | (18) |  | $ | (2,027) |  | $ | (438) |  | $ | (2,483)
Net unrealized losses |  |  | (11) |  |  | ― |  |  | ― |  |  | (11)
Net translation gains of investments in foreign operations |  |  | ― |  |  | 3 |  |  | ― |  |  | 3
Net losses related to hedges of investments in foreign operations |  |  | ― |  |  | (22) |  |  | ― |  |  | (22)
Pension and other postretirement benefit |  |  | ― |  |  | ― |  |  | 9 |  |  | 9
Net change in accumulated other comprehensive loss |  |  | (11) |  |  | (19) |  |  | 9 |  |  | (21)
Balances as of September 30, 2018 |  | $ | (29) |  | $ | (2,046) |  | $ | (429) |  | $ | (2,504)
Nine Months Ended September 30, 2018 (Millions), net of tax |  | Net Unrealized Losses on Debt Securities |  | Foreign Currency Translation Adjustments |  | Net Unrealized Pension and Other Postretirement Benefit (Losses) Gains |  | Accumulated Other Comprehensive (Loss) Income
Balances as of December 31, 2017 |  | $ | ― |  | $ | (1,961) |  | $ | (467) |  | $ | (2,428)
Net unrealized losses |  |  | (31) |  |  | ― |  |  | ― |  |  | (31)
Net translation losses of investments in foreign operations |  |  | ― |  |  | (221) |  |  | ― |  |  | (221)
Net gains related to hedges of investments in foreign operations |  |  | ― |  |  | 136 |  |  | ― |  |  | 136
Pension and other postretirement benefit |  |  | ― |  |  | ― |  |  | 38 |  |  | 38
Other(a) |  |  | 2 |  |  | ― |  |  | ― |  |  | 2
Net change in accumulated other comprehensive loss |  |  | (29) |  |  | (85) |  |  | 38 |  |  | (76)
Balances as of September 30, 2018 |  | $ | (29) |  | $ | (2,046) |  | $ | (429) |  | $ | (2,504)
Repres ents 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 (refer to Note 1).
Three Months Ended September 30, 2017 (Millions), net of tax |  | Net Unrealized Gains (Losses) on Investment Securities |  | Foreign Currency Translation Adjustments |  | Net Unrealized Pension and Other Postretirement Benefit (Losses) Gains |  | Accumulated Other Comprehensive (Loss) Income
Balances as of June 30, 2017 |  | $ | 13 |  | $ | (1,913) |  | $ | (528) |  | $ | (2,428)
Net unrealized losses |  |  | (2) |  |  | ― |  |  | ― |  |  | (2)
Decrease due to amounts reclassified into earnings |  |  | ― |  |  | (1) |  |  | ― |  |  | (1)
Net translation gain of investments in foreign operations |  |  | ― |  |  | 292 |  |  | ― |  |  | 292
Net losses related to hedges of investments in foreign operations |  |  | ― |  |  | (184) |  |  | ― |  |  | (184)
Pension and other postretirement benefit |  |  | ― |  |  | ― |  |  | 7 |  |  | 7
Net change in accumulated other comprehensive loss |  |  | (2) |  |  | 107 |  |  | 7 |  |  | 112
Balances as of September 30, 2017 |  | $ | 11 |  | $ | (1,806) |  | $ | (521) |  | $ | (2,316)
Nine Months Ended September 30, 2017 (Millions), net of tax |  | Net Unrealized Gains on Investment Securities |  | Foreign Currency Translation Adjustments |  | Net Unrealized Pension and Other Postretirement Benefit (Losses) Gains |  | Accumulated Other Comprehensive (Loss) Income
Balances as of December 31, 2016 |  | $ | 7 |  | $ | (2,262) |  | $ | (529) |  | $ | (2,784)
Net unrealized gains |  |  | 4 |  |  | ― |  |  | ― |  |  | 4
Decrease due to amounts reclassified into earnings |  |  | ― |  |  | (1) |  |  | ― |  |  | (1)
Net translation gain of investments in foreign operations(a) |  |  | ― |  |  | 972 |  |  | ― |  |  | 972
Net losses related to hedges of investments in foreign operations |  |  | ― |  |  | (515) |  |  | ― |  |  | (515)
Pension and other postretirement benefit |  |  | ― |  |  | ― |  |  | 8 |  |  | 8
Net change in accumulated other comprehensive loss |  |  | 4 |  |  | 456 |  |  | 8 |  |  | 468
Balances as of September 30, 2017 |  | $ | 11 |  | $ | (1,806) |  | $ | (521) |  | $ | (2,316)
Includes $289 million of tax benefits recognized in the nine months ended September 30, 2017.
Accumulated Other Comprehensive Loss Income - Tax Effect | The foll owing table shows the tax impact for the three and nine months ended September 30 for the changes in each component of AOCI presented above:
|  |  | Tax (benefit) expense
|  |  |  | Three Months Ended September 30, |  | Nine Months Ended September 30,
(Millions) |  | 2018 |  | 2017 |  | 2018 |  | 2017
Investment securities |  | $ | (4) |  | $ | (1) |  | $ | (9) |  | $ | 2
Foreign currency translation adjustments(a) |  |  | 8 |  |  | (25) |  |  | (60) |  |  | (204)
Net investment hedges |  |  | (7) |  |  | (99) |  |  | 46 |  |  | (306)
Pension and other postretirement benefits |  |  | 3 |  |  | (2) |  |  | 12 |  |  | (10)
Total tax impact |  | $ | ― |  | $ | (127) |  | $ | (11) |  | $ | (518)
(a) Includes $289 million of tax benefits recognized in the nine months ended September 30, 2017.
Reclassification out of accumulated other comprehensive (loss) income | The following table presents the effects of reclassifications out of AOCI and into the Consolidated Statements of Income:
|  |  |  |  |  | Gains (losses) recognized in earnings
|  |  |  |  |  | Three Months Ended |  |  | Nine Months Ended
|  |  |  |  |  | September 30, |  |  | September 30,
|  |  |  |  |  |  | Amount |  |  | Amount
Description (Millions) |  | Income Statement Line Item |  | 2018 |  | 2017 |  | 2018 |  | 2017
Foreign currency translation adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Reclassification of translation adjustments and related hedges |  | Other expenses |  | $ | ― |  | $ | (6) |  | $ | 1 |  | $ | (6)
| Related income tax |  | Income tax provision |  |  | ― |  |  | 7 |  |  | (1) |  |  | 7
Total |  |  |  | $ | ― |  | $ | 1 |  | $ | ― |  | $ | 1

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e526-108580 + Details
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