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Receivables, net, Contract Assets and Contract Liabilities
 12 Months Ended
Dec. 31, 2021
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):
20212020
Receivables, net$1,963 $1,978 
Contract assets10,579 9,545 
Contract liabilities8,107 7,545 
Receivables, net consist of approximately $1.3 billion from the U.S. Government and $708 million from other governments and commercial customers as of December 31, 2021. Substantially all accounts receivable at December 31, 2021 are expected to be collected in 2022. We do not believe we have significant exposure to credit risk as the majority of our accounts receivable are due from the U.S. Government either as the ultimate customer or in connection with foreign military sales.
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 $43.9 billion and $39.7 billion as of December 31, 2021 and 2020. Contract assets increased $1.0 billion during 2021, primarily due to the recognition of revenue related to the satisfaction or partial satisfaction of performance obligations during 2021 for which we have not yet billed our customers. There were no significant impairment losses related to our contract assets during 2021 and 2020. We expect to bill our customers for the majority of the December 31, 2021 contract assets during 2022.
Contract liabilities increased $562 million during 2021, primarily due to payments received in excess of revenue recognized on these performance obligations. During 2021, we recognized $4.5 billion of our contract liabilities at December 31, 2020 as revenue. During 2020, we recognized $4.0 billion of our contract liabilities at December 31, 2019 as revenue. During 2019, we recognized $3.9 billion of our contract liabilities at December 31, 2018 as revenue.