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Pensions and Other Post-retirement Benefit Plans - Defined Benefit Pension Plans' Major Asset Categories and Their Associated Fair Values (Details) - USD ($)
$ in Millions
Jun. 28, 2019
Jun. 29, 2018
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, fair value of plan assets $ 208 $ 200
Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, fair value of plan assets 9 3
Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, fair value of plan assets 199 197
Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, fair value of plan assets 0 0
Equity Commingled/Mutual Funds    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, fair value of plan assets 68 68
Equity Commingled/Mutual Funds | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, fair value of plan assets 0 0
Equity Commingled/Mutual Funds | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, fair value of plan assets 68 68
Equity Commingled/Mutual Funds | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, fair value of plan assets 0 0
Fixed income commingled/mutual funds    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, fair value of plan assets 131 125
Fixed income commingled/mutual funds | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, fair value of plan assets 0 0
Fixed income commingled/mutual funds | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, fair value of plan assets 131 125
Fixed income commingled/mutual funds | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, fair value of plan assets 0 0
Cash equivalents and short-term investments    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, fair value of plan assets 9 7
Cash equivalents and short-term investments | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, fair value of plan assets 9 3
Cash equivalents and short-term investments | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, fair value of plan assets 0 4
Cash equivalents and short-term investments | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, fair value of plan assets $ 0 $ 0