Fair Value Measurements - Assets and Liabilities Measured on a Recurring Basis (Details) - Fair Value - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Sep. 29, 2017	Jun. 30, 2017
Assets
Fair value of plan assets	$ 123	$ 112
Investments Measured at NAV, assets	74	75
Liabilities
Fair value of plan liabilities	142	126
Equity securities and mutual funds
Liabilities
Fair value of plan liabilities	56	46
Common/collective trusts and guaranteed investment contracts
Liabilities
Investments Measured at NAV, liabilities	86	80
Equity security
Assets
Fair value of plan assets	49	37
Corporate-owned life insurance
Assets
Investments Measured at NAV, assets	25	25
Equity fund
Assets
Investments Measured at NAV, assets	49	50
Level 1 | Equity securities and mutual funds
Liabilities
Fair value of plan liabilities	56	46
Level 1 | Equity security
Assets
Fair value of plan assets	$ 49	$ 37