Income Taxes (Narrative) (Details) - USD ($) $ in Millions	Jun. 30, 2019	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Net operating loss carryforwards	$ 107	$ 11
Valuation allowance	6	45
Liabilities for accrued interest related to uncertain tax benefits	26	20
Unrecognized tax benefits that would impact effective tax rate	$ 74	$ 72

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount of interest expense accrued for an underpayment of income taxes.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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