Pensions and Other Post-retirement Benefit Plans Defined Benefit Pension Plans' Major Asset Categories and Their Associated Fair Values (Details) - USD ($) $ in Millions		Jun. 29, 2018	Jun. 30, 2017
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		$ 200	$ 189
Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		3	2
Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		197	187
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	[1],[2]	68	67
Equity Commingled/Mutual Funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	[1],[2]	0	0
Equity Commingled/Mutual Funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	[1],[2]	68	67
Equity Commingled/Mutual Funds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	[1],[2]	0	0
Fixed income commingled/mutual funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	[1],[3]	125	116
Fixed income commingled/mutual funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	[1],[3]	0	0
Fixed income commingled/mutual funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	[1],[3]	125	116
Fixed income commingled/mutual funds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	[1],[3]	0	0
Cash equivalents and short-term investments
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		7	6
Cash equivalents and short-term investments | Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		3	2
Cash equivalents and short-term investments | Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		4	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

[1] Commingled funds represent pooled institutional investments.

[2] Equity mutual funds invest primarily in equity securities.

[3] Fixed income mutual funds invest primarily in fixed income securities.