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Postretirement Benefit Plans - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 30, 2016
Jan. 01, 2016
Dec. 30, 2016
Jan. 01, 2016
Jul. 01, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Reduction in interest and service cost during period as result of change in estimates $ (27) $ (128) $ (53) $ (135)  
Defined benefit plan, contributions by employer during period     103 $ 97  
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year     485    
Defined benefit plans, estimated voluntary Future Employer contributions in current fiscal year     $ 400    
U.S SRP          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Value of defined benefit pension plan assets         $ 3,800
Projected benefit obligation of defined pension plan         $ 5,900
Cash balance percentage to replace frozen benefits under defined pension plan 1.00%   1.00%    
Change in Assumptions for Pension Plans | U.S SRP          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Reduction in interest and service cost during period as result of change in estimates     $ (23)