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Debt (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Dec. 29, 2017
Jun. 30, 2017
Dec. 29, 2017
Dec. 30, 2016
Debt Instrument [Line Items]        
Stock closing price $ 28.06   $ 28.06  
Debt repayments     $ 2,640 $ 62
2.5% Convertible Senior Notes due April 1, 2021        
Debt Instrument [Line Items]        
If-converted value in excess of principal     337  
2.0% Convertible Senior Notes due August 15, 2021        
Debt Instrument [Line Items]        
If-converted value in excess of principal     $ 469  
Senior Notes | Senior Term Loan A-5 due August 1, 2021        
Debt Instrument [Line Items]        
Debt repayments   $ 1,200    
Senior Notes | Senior Term Loan A-1 due May 10, 2019        
Debt Instrument [Line Items]        
Debt repayments $ 500 200    
Senior Notes | 2.75% Senior Notes due June 15, 2017        
Debt Instrument [Line Items]        
Debt repayments   $ 600    
Stated interest rate (as a percent) 2.75% 2.75% 2.75%  
Senior Notes | Senior Term Loan A-3 due August 1, 2019        
Debt Instrument [Line Items]        
Debt repayments $ 130      
Convertible Debt | 2.5% Convertible Senior Notes due April 1, 2021        
Debt Instrument [Line Items]        
Stated interest rate (as a percent) 2.50%   2.50%  
Convertible Debt | 2.0% Convertible Senior Notes due August 15, 2021        
Debt Instrument [Line Items]        
Stated interest rate (as a percent) 2.00%   2.00%