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Contract and Other Deferred Assets (Tables)
 12 Months Ended
Dec. 31, 2021
Revenue from Contract with Customer [Abstract]  
Schedule of Contract Assets Contract assets are comprised of the following at December 31:
20212020
Long-term product service agreements $589 $660 
Long-term equipment contracts (1)
825 1,160 
Contract assets (total revenue in excess of billings)1,414 1,820 
Deferred inventory costs156 138 
Non-recurring engineering costs28 43 
Contract and other deferred assets$1,598 $2,001 
(1)Reflects revenue earned in excess of billings on our long-term contracts to construct technically complex equipment and certain other service agreements.
Contract liabilities are comprised of the following at December 31:
20212020
Progress collections$3,108 $3,352 
Deferred income124 102 
Progress collections and deferred income (contract liabilities)$3,232 $3,454