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Accumulated Other Comprehensive Loss (Tables) | 3 Months Ended
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Mar. 31, 2021
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, 2021 and 2020 is provided below:
(dollars in millions) | Foreign Currency Translation |  | Defined Benefit Pension and Post-retirement Plans |  | Unrealized Hedging (Losses) Gains |  | Accumulated Other Comprehensive Income (Loss)
Balance at December 31, 2020 | $ | 710 |  |  | $ | (4,483) |  |  | $ | 39 |  |  | $ | (3,734) |
Other comprehensive income (loss) before reclassifications, net | (176) |  |  | (10) |  |  | (46) |  |  | (232) |
Amounts reclassified, pre-tax | — |  |  | 64 |  |  | (14) |  |  | 50 |
Tax benefit (expense) | (5) |  |  | (12) |  |  | 12 |  |  | (5) |
Balance at March 31, 2021 | $ | 529 |  |  | $ | (4,441) |  |  | $ | (9) |  |  | $ | (3,921) |
(dollars in millions) | Foreign Currency Translation |  | Defined Benefit Pension and Post-retirement Plans |  | Unrealized Hedging (Losses) Gains |  | Accumulated Other Comprehensive Income (Loss)
Balance at December 31, 2019 | $ | (3,211) |  |  | $ | (6,772) |  |  | $ | (166) |  |  | $ | (10,149) |
Other comprehensive income (loss) before reclassifications, net | (1,445) |  |  | 8 |  |  | (403) |  |  | (1,840) |
Amounts reclassified, pre-tax | — |  |  | 102 |  |  | 29 |  |  | 131 |
Tax expense (benefit) | 9 |  |  | (31) |  |  | 92 |  |  | 70 |
Balance at March 31, 2020 | $ | (4,647) |  |  | $ | (6,693) |  |  | $ | (448) |  |  | $ | (11,788) |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: 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=121641772&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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