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Accumulated Other Comprehensive Loss | 3 Months Ended
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Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Accumulated Other Comprehensive Income (Loss) Disclosure [Text Block] | Accumulated Other Comprehensive Loss A summary of the changes in each component of Accumulated other comprehensive loss, net of tax for the quarters ended March 31, 2019 and 2018 is provided below:
| Quarter Ended March 31, 2019
(dollars in millions) | Foreign Currency Translation |  | Defined Benefit Pension and Post- retirement Plans |  | Unrealized Gains (Losses) on Available-for-Sale Securities |  | Unrealized Hedging (Losses) Gains |  | Accumulated Other Comprehensive (Loss) Income
Balance at December 31, 2018 | $ | (3,442 | ) |  | $ | (5,718 | ) |  | $ | — |  |  | $ | (173 | ) |  | $ | (9,333 | )
Other comprehensive income (loss) before reclassifications, net | 530 |  |  | (1 | ) |  | — |  |  | 7 |  |  | 536 |
Amounts reclassified, pre-tax | 1 |  |  | 44 |  |  | — |  |  | 4 |  |  | 49 |
Tax benefit reclassified | (13 | ) |  | (10 | ) |  | — |  |  | (3 | ) |  | (26 | )
ASU 2018-02 adoption impact | (8 | ) |  | (737 | ) |  | — |  |  | — |  |  | (745 | )
Balance at March 31, 2019 | $ | (2,932 | ) |  | $ | (6,422 | ) |  | $ | — |  |  | $ | (165 | ) |  | $ | (9,519 | )
| Quarter Ended March 31, 2018
(dollars in millions) | Foreign Currency Translation |  | Defined Benefit Pension and Post- retirement Plans |  | Unrealized Gains (Losses) on Available-for-Sale Securities |  | Unrealized Hedging (Losses) Gains |  | Accumulated Other Comprehensive (Loss) Income
Balance at December 31, 2017 | $ | (2,950 | ) |  | $ | (4,652 | ) |  | $ | 5 |  |  | $ | 72 |  |  | $ | (7,525 | )
Other comprehensive income (loss) before reclassifications, net | 376 |  |  | 8 |  |  | — |  |  | 45 |  |  | 429 |
Amounts reclassified, pre-tax | — |  |  | 88 |  |  | — |  |  | (27 | ) |  | 61 |
Tax expense (benefit) reclassified | 130 |  |  | (23 | ) |  | — |  |  | (4 | ) |  | 103 |
ASU 2016-01 adoption impact | — |  |  | — |  |  | (5 | ) |  | — |  |  | (5 | )
Balance at March 31, 2018 | $ | (2,444 | ) |  | $ | (4,579 | ) |  | $ | — |  |  | $ | 86 |  |  | $ | (6,937 | )
In February 2018, the FASB issued ASU 2018-02, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income (Topic 220). The new standard allows companies to reclassify to retained earnings the stranded tax effects in accumulated other comprehensive income (AOCI) from the TCJA. We elected to reclassify the income tax effects of TCJA from AOCI of $745 million to retained earnings, effective January 1, 2019. In January 2016, the FASB issued ASU 2016-01, Financial Instruments - Overall: Recognition and Measurement of Financial Assets and Financial Liabilities. This ASU modifies how entities measure equity investments and present changes in the fair value of financial liabilities. Upon adoption, investments that do not result in consolidation and are not accounted for under the equity method generally must be carried at fair value, with changes in fair value recognized in net income. We had approximately $5 million of unrealized gains on these securities recorded in Accumulated other comprehensive loss in our Consolidated Balance Sheet as of December 31, 2017. We adopted this standard effective January 1, 2018, with these amounts recorded directly to retained earnings as of that date. Amounts reclassified that relate to our defined benefit pension and postretirement plans include the amortization of prior service costs and actuarial net losses recognized during each period presented. These costs are recorded as components of net periodic pension cost for each period presented (see Note 7 for additional details). All noncontrolling interests with redemption features, such as put options, that are not solely within our control (redeemable noncontrolling interests) are reported in the mezzanine section of the Condensed Consolidated Balance Sheet, between liabilities and equity, at the greater of redemption value or initial carrying value.

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