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CONTRACT ASSETS AND LIABILITIES
6 Months Ended
Jun. 27, 2021
Revenue from Contract with Customer [Abstract]  
CONTRACT ASSETS AND LIABILITIES CONTRACT ASSETS AND LIABILITIES
Contract assets include unbilled amounts typically resulting from sales under contracts when the percentage-of-completion cost-to-cost method of revenue recognition is utilized and revenue recognized exceeds the amount billed to the customer. Contract liabilities include advance payments and billings in excess of revenue recognized. Contract assets and contract liabilities were as follows (in millions):
June 27,
2021
December 31,
2020
Contract assets $11,425 $9,545 
Contract liabilities7,379 7,545 
Contract assets increased $1.9 billion during the six months ended June 27, 2021, primarily due to the recognition of revenue related to the satisfaction or partial satisfaction of performance obligations during the six months ended June 27, 2021 for which we have not yet billed our customers. There were no significant credit or impairment losses related to our contract assets during the quarters and six months ended June 27, 2021 and June 28, 2020.
Contract liabilities decreased $166 million during the six months ended June 27, 2021, primarily due to revenue recognized in excess of payments received on these performance obligations. During the quarter and six months ended June 27, 2021, we recognized $900 million and $3.2 billion of our contract liabilities at December 31, 2020 as revenue. During the quarter and six months ended June 28, 2020, we recognized $1.0 billion and $2.6 billion of our contract liabilities at December 31, 2019 as revenue.