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Progress Collections and Deferred Income
6 Months Ended
Jun. 30, 2018
Revenue Recognition and Deferred Revenue [Abstract]  
Progress Collections and Deferred Income
PROGRESS COLLECTIONS AND DEFERRED INCOME
Contract liabilities include progress collections, which reflects billings in excess of revenue, and deferred income on our long-term contracts to construct technically complex equipment, long-term product maintenance or extended warranty arrangements. Contract liabilities are comprised of the following:
 
June 30, 2018
December 31, 2017
Progress collections
$
1,466

$
1,456

Deferred income
164

319

Progress collections and deferred income (contract liabilities) (1)
$
1,630

$
1,775

(1) 
Progress collections and deferred income (contract liabilities) were $2,038 million at January 1, 2017.
Revenue recognized during the three months ended June 30, 2018 and 2017 that was included in the contract liabilities at the beginning of the period was $404 million and $506 million, respectively, and $1,006 million and $1,035 million, respectively, during the six months ended June 30, 2018 and 2017.