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Receivables, net, Contract Assets and Contract Liabilities
 12 Months Ended
Dec. 31, 2020
Revenue from Contract with Customer [Abstract]  
Receivables, net, Contract Assets and Contract Liabilities Receivables, net, Contract Assets and Contract Liabilities
Receivables, net, contract assets and contract liabilities were as follows (in millions):
20202019
Receivables, net$1,978 $2,337 
Contract assets9,545 9,094 
Contract liabilities7,545 7,054 
Receivables, net consist of approximately $1.2 billion from the U.S. Government and $735 million from other governments and commercial customers as of December 31, 2020.
Contract assets are net of progress payments and performance based payments from our customers as well as advance payments from non-U.S. Government customers totaling approximately $39.7 billion and $33.0 billion as of December 31,
2020 and 2019. Contract assets increased $451 million during 2020, primarily due to the recognition of revenue related to the satisfaction or partial satisfaction of performance obligations during 2020 for which we have not yet billed our customers. There were no significant impairment losses related to our contract assets during 2020 and 2019. We expect to bill our customers for the majority of the December 31, 2020 contract assets during 2021.
Contract liabilities increased $491 million during 2020, primarily due to payments received in excess of revenue recognized on these performance obligations. During 2020, we recognized $4.0 billion of our contract liabilities at December 31, 2019 as revenue. During 2019 and 2018, we recognized $3.9 billion of our contract liabilities at December 31, 2018 and 2017, respectively, as revenue.