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Postretirement Benefit Plans - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 29, 2017
Dec. 30, 2016
Dec. 29, 2017
Dec. 30, 2016
Jun. 30, 2017
U.S. | Qualified Defined Pension Plan          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Defined benefit plan, contributions by employer during period $ 0 $ 39,000,000 $ 0 $ 103,000,000 $ 400,000,000
Defined benefit plans, estimated future employer contributions in current fiscal year 300,000,000   300,000,000    
U.S. | U.S. SRP          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Value of defined benefit pension plan assets         4,400,000,000
Projected benefit obligation of defined pension plan         $ 5,600,000,000
Cash balance percentage to replace frozen benefits under defined pension plan   1.00%   1.00%  
Non-U.S | Qualified Defined Pension Plan          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Defined benefit plans, estimated future employer contributions in current fiscal year $ 1,000,000   $ 1,000,000