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Accumulated Other Comprehensive Loss (Tables) | 3 Months Ended
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Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | 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 | )

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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