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Discontinued Operations - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Apr. 28, 2017
Jan. 01, 2017
Sep. 29, 2017
Sep. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Income from sale of discontinued operations per diluted share (in dollars per share)     $ (0.06) $ 0.11
IT Services | Critical Networks | Discontinued Operations, Disposed of by Sale        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Proceeds from sale of discontinued operations, subject to post-closing adjustments, net $ 646      
Gain (loss) on sale of discontinued operations, before tax (28)      
Gain on sale of discontinued operations, net of tax $ 55      
Income from sale of discontinued operations per diluted share (in dollars per share) $ 0.44      
Discontinued operations, period of continuing involvement after disposal 18 months      
CapRock | Discontinued Operations, Disposed of by Sale        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Proceeds from sale of discontinued operations, subject to post-closing adjustments, net   $ 370    
Gain (loss) on sale of discontinued operations, before tax   14    
Gain on sale of discontinued operations, net of tax   $ 61    
Income from sale of discontinued operations per diluted share (in dollars per share)   $ 0.49    
Discontinued operations, period of continuing involvement after disposal   12 months