Income Taxes (Schedule of Deferred Tax Assets and Liabilities After Netting by Tax Jurisdiction) (Details) - USD ($) $ in Millions	Jun. 30, 2016	Jun. 30, 2015
Income Tax Disclosure [Abstract]
Current deferred income tax asset	$ 0	$ 22
Noncurrent deferred income tax asset	42	17
Current deferred income tax liability	0	(1,066)
Noncurrent deferred income tax liability	(1,698)	(328)
Net deferred income tax liability	$ (1,656)	$ (1,355)