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Fair Value (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 30, 2018
Mar. 30, 2018
Mar. 31, 2017
Jun. 30, 2017
Fair Value Measurements Using Significant Unobservable Inputs (Level 3), reconciliation        
Impairment of assets held for sale   $ 0 $ 35,000,000  
Gain (loss) on assets held for sale $ 1,000,000      
Recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member]        
Auction rate securities        
Assets, fair value disclosure, recurring 0 0   $ 0
Liabilities, fair value disclosure, recurring 0 0   0
Other Nonoperating Income (Expense) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member]        
Fair Value Measurements Using Significant Unobservable Inputs (Level 3), reconciliation        
Cost-method investments, other than temporary impairment 3,000,000 3,000,000 $ 25,000,000  
Land and building [Member] | Operating Expense [Member]        
Fair Value Measurements Using Significant Unobservable Inputs (Level 3), reconciliation        
Impairment of assets held for sale   0   35,000,000
Other current assets [Member] | Land and building [Member] | Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member]        
Fair Value Measurements Using Significant Unobservable Inputs (Level 3), reconciliation        
Assets held-for-sale, long lived, fair value 36,000,000 36,000,000   77,000,000
Cost-method investments [Member] | Other current assets [Member] | Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member]        
Fair Value Measurements Using Significant Unobservable Inputs (Level 3), reconciliation        
Cost method investment $ 125,000,000 $ 125,000,000   $ 125,000,000