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Contract Assets and Contract Liabilities (Tables)
 12 Months Ended
Dec. 31, 2019
Contract with Customer, Asset and Liability [Abstract]  
Net Contract Assets (Liabilities)
Net contract assets (liabilities) consisted of the following at December 31:
(In millions)
 
2019
 
2018
 
$ Change
 
% Change
Contract assets
 
$
6,122

 
$
5,594

 
$
528

 
9.4
%
Contract liabilities—current
 
(3,267
)
 
(3,309
)
 
42

 
1.3
%
Contract liabilities—noncurrent
 
(143
)
 
(150
)
 
7

 
4.7
%
Net contract assets (liabilities)
 
$
2,712

 
$
2,135

 
$
577

 
27.0
%
Schedule of Contract Assets
Contract assets consisted of the following at December 31: 
(In millions)
2019

 
2018

Unbilled
$
13,308

 
$
12,058

Progress payments
(7,186
)
 
(6,464
)
Total contract assets
$
6,122

 
$
5,594