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Contract Asset & Liability (Tables) | 12 Months Ended
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Dec. 31, 2019
Contract with Customer, Asset and Liability [Abstract] |
Contract with Customer, Asset and Liability [Table Text Block] | Total contract assets and contract liabilities as of December 31, 2019 and 2018 are as follows:
(dollars in millions) | December 31, 2019 |  | December 31, 2018
Total contract assets | $ | 4,462 |  |  | $ | 3,666 |
Total contract liabilities | (9,014) |  |  | (7,818) |
Net contract liabilities | $ | (4,552) |  |  | $ | (4,152) |

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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130551-203045 + Details
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