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Accumulated Other Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2019
Stockholders' Equity Note [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | A summary of the changes in each component of Accumulated other comprehensive (loss) income, net of tax for the years ended December 31, 2019 and 2018 is provided below:
(dollars in millions) |  | Foreign Currency Translation |  | Defined Benefit Pension and Postretirement 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 before reclassifications, net |  | (486) |  |  | (1,736) |  |  | — |  |  | (307) |  |  | (2,529) |
Amounts reclassified, pre-tax |  | (2) |  |  | 344 |  |  | — |  |  | (16) |  |  | 326 |
Tax (expense) benefit |  | (4) |  |  | 326 |  |  | — |  |  | 78 |  |  | 400 |
ASU 2016-01 adoption impact |  | $ | — |  |  | $ | — |  |  | $ | (5) |  |  | $ | — |  |  | $ | (5) |
Balance at December 31, 2018 |  | $ | (3,442) |  |  | $ | (5,718) |  |  | $ | — |  |  | $ | (173) |  |  | $ | (9,333) |
Other comprehensive loss before reclassifications, net |  | 280 |  |  | (584) |  |  | — |  |  | (33) |  |  | (337) |
Amounts reclassified, pre-tax |  | 2 |  |  | 170 |  |  | — |  |  | 51 |  |  | 223 |
Tax (expense) benefit |  | (43) |  |  | 97 |  |  | — |  |  | (11) |  |  | 43 |
ASU 2018-02 adoption impact |  | (8) |  |  | (737) |  |  | — |  |  | — |  |  | (745) |
Balance at December 31, 2019 |  | $ | (3,211) |  |  | $ | (6,772) |  |  | $ | — |  |  | $ | (166) |  |  | $ | (10,149) |

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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=118930883&loc=SL7669686-108580 + Details
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- References No definition available. + Details
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