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CONTRACT ASSETS AND LIABILITIES (Tables)
 6 Months Ended
Jun. 30, 2019
Revenue from Contract with Customer [Abstract]  
Summary of Contract Assets and Liabilities Contract assets and contract liabilities were as follows (in millions):
 
 
June 30,
2019
 
December 31,
2018
Contract assets
 
$
10,388

 
 
$
9,472

 
Contract liabilities
 
6,766

 
 
6,491