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Shareholders' Equity - Dividends (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jan. 14, 2019
Dec. 28, 2018
Dec. 29, 2017
Dec. 28, 2018
Dec. 29, 2017
Dividends Payable [Line Items]          
Cash dividends declared per share (in USD per share)   $ 0.50 $ 0.50 $ 1.00 $ 1.00
Cash dividends declared, total value       $ 290  
Subsequent Event          
Dividends Payable [Line Items]          
Payment of common stock dividends $ 146        
Dividends payable, date to be paid Jan. 14, 2019