Fair Value Measurements - Assets and Liabilities Measured on a Recurring Basis (Details) - Fair Value, Measurements, Recurring - Fair Value - USD ($) $ in Millions	Dec. 29, 2017	Jun. 30, 2017
Assets
Deferred compensation plan assets	$ 87	$ 75
Liabilities
Deferred compensation plan liabilities	154	126
Equity securities and mutual funds
Liabilities
Deferred compensation plan liabilities	44	46
Common/collective trusts and guaranteed investment contracts
Liabilities
Investments measured at NAV, liabilities	110	80
Corporate-owned life insurance
Assets
Deferred compensation plan assets	26	25
Equity fund
Assets
Deferred compensation plan assets	61	50
Level 1 | Equity securities and mutual funds
Liabilities
Deferred compensation plan liabilities	$ 44	$ 46