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Income Taxes Valuation Allowance, Additional Details (Details) - USD ($)
3 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Income Tax Disclosure [Abstract]      
Acquisition of businesses     $ 2,400,000,000
Valuation Allowance, Deferred Tax Asset, Increase, Amount $ 56,000,000 $ 27,000,000 $ 0