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Contract Assets and Liabilities (Tables) | 3 Months Ended
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Mar. 31, 2020
Revenue from Contract with Customer [Abstract] |
Contract Assets and Liabilities | The following summarizes information about our contract assets and liabilities:
(in millions) | March 31, 2020 | December 31, 2019
Information about contract assets: |  |
Contract assets |  |
Unbilled receivables | $ | 840 |  | $ | 851 |
Contract work in progress | 471 |  | 387 |
Contract assets | $ | 1,311 |  | $ | 1,238 |
Advance billings deducted from contract assets | $ | 515 |  | $ | 574 |
| Three Months Ended March 31,
(in millions) | 2020 | 2019
Information about contract liabilities: |  |
Revenue recognized during the year that was included in contract liabilities as of January 1 | $ | 543 |  | $ | 581 |

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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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