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Discontinued Operations - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Jan. 26, 2017
Jan. 01, 2017
Feb. 04, 2013
Dec. 05, 2012
Mar. 31, 2017
Apr. 01, 2016
Jan. 01, 2016
Mar. 31, 2017
Apr. 01, 2016
Nov. 01, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Impairment of goodwill and other assets               $ 240 $ 367  
Gain (loss) on sale of discontinued operations         $ 5 $ 0   (2) (21)  
Discontinued operations, net of income taxes               $ 23 $ 0  
Earnings per diluted share (in usd per share)         $ 0.69 $ 1.34   $ 3.37 $ 1.31  
IT Services Business | Discontinued Operations, Held-for-sale | Critical Networks                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Discontinued operations, period of continuing involvement after disposal 18 months                  
Goodwill, discontinued operations         $ 487     $ 487    
Impairment of goodwill and other assets               238    
Goodwill, Impairment Loss               228    
Cash consideration received on disposal of discontinued operations $ 690                  
Gain (loss) on sale of discontinued operations         (21) $ 0   (28) $ 0  
CapRock | Discontinued Operations, Disposed of by Sale | Critical Networks                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Discontinued operations, period of continuing involvement after disposal   12 months                
Cash consideration received on disposal of discontinued operations                   $ 425
Proceeds from sale of discontinued operations, subject to post-closing adjustments, net   $ 375                
Gain (loss) on sale of discontinued operations   23     $ 23 $ 0   $ 23 $ 0  
Discontinued operations, net of income taxes   $ 70                
Earnings per diluted share (in usd per share)   $ 0.56                
Broadcast Communications | Discontinued Operations, Disposed of by Sale                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Cash consideration received on disposal of discontinued operations     $ 160              
Gain (loss) on sale of discontinued operations             $ (21)      
Discontinued operations, net of income taxes             $ (17)      
Earnings per diluted share (in usd per share)             $ (0.14)      
Asset sale agreement       $ 225            
Asset sale agreement, promissory note     15              
Asset sale agreement, earnout     $ 50