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Investments (Schedule of Investments) (Parenthetical) (Details) - USD ($)
6 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Investment Holdings [Line Items]    
Cash distributions received from affiliates $ 11,000,000 $ 184,000,000
Fair value measurements recurring    
Investment Holdings [Line Items]    
Investment in available-for-sale securities [1] 312,000,000  
Sky    
Investment Holdings [Line Items]    
Cash distributions received from affiliates 0 $ 170,000,000
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Fair value measurements recurring    
Investment Holdings [Line Items]    
Investment in available-for-sale securities [1] 312,000,000  
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Sky    
Investment Holdings [Line Items]    
Market value of equity method investments $ 9,200,000,000  
[1] Represents an investment in available-for-sale securities.