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DIVESTITURES, ASSET SALES AND DISCONTINUED OPERATIONS - Income Statement (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jan. 01, 2017
Jan. 03, 2020
Dec. 28, 2018
Jun. 28, 2019
Jun. 29, 2018
Jun. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Loss on sale of discontinued operations, net   $ 12   $ 0 $ 0 $ 0
Discontinued operations, net of income taxes   (1) $ (3) (4) (3) (85)
Discontinued Operations, Held-for-sale or Disposed of by Sale            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Revenue from product sales and services   0   0 0 1,039
Cost of product sales and services   0   0 0 (885)
Engineering, selling and administrative expenses   0   0 0 (91)
Impairment of goodwill and other assets   0   0 0 (240)
Non-operating loss, net   (1)   (5) (8) (7)
Loss before income taxes   (1)   (5) (8) (184)
Loss on sale of discontinued operations, net   0   0 0 (11)
Income tax benefit   0   1 5 110
Discontinued operations, net of income taxes   (1)   (4) (3) (85)
Discontinued Operations, Held-for-sale or Disposed of by Sale | IT Services            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Revenue from product sales and services       0 0 895
Cost of product sales and services       0 0 (777)
Engineering, selling and administrative expenses       0 0 (68)
Impairment of goodwill and other assets       0 0 (240)
Non-operating loss, net       (1) (4) (9)
Loss before income taxes       (1) (4) (199)
Loss on sale of discontinued operations, net       0 0 (28)
Income tax benefit       0 5 69
Discontinued operations, net of income taxes       (1) 1 (158)
Discontinued Operations, Held-for-sale or Disposed of by Sale | CapRock            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Revenue from product sales and services   0   0 0 144
Cost of product sales and services   0   0 0 (108)
Engineering, selling and administrative expenses   0   0 0 (23)
Non-operating loss, net   (1)   (3) (4) 4
Loss before income taxes   (1)   (3) (4) 17
Loss on sale of discontinued operations, net   0   0 0 14
Income tax benefit   0   1 0 41
Discontinued operations, net of income taxes   $ (1)   $ (2) $ (4) 72
Discontinued Operations, Disposed of by Sale | Broadcast Communications            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Non-operating loss, net           (2)
Decrease in loss in sale of discontinued operations, net of tax           $ 3
Discontinued Operations, Disposed of by Sale | CapRock            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Loss on sale of discontinued operations, net $ 14