Income Taxes - Schedule of Income Tax Net Operating Loss Carryforwards (NOLs) (Gross, Net Uncertain Tax Benefits) (Detail) - Jun. 30, 2015 - USD ($) $ in Millions	Total
U.S. Federal [Member]
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards, Amount	$ 833
U.S. Federal [Member] | Minimum [Member]
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards, expiration	Dec. 31, 2017
U.S. Federal [Member] | Maximum [Member]
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards, expiration	Dec. 31, 2034
U.S. States [Member]
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards period expiration, description	Various
Net Operating Loss Carryforwards, Amount	$ 223
Foreign Tax Authority [Member] | Australia [Member]
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards period expiration, description	Indefinite
Net Operating Loss Carryforwards, Amount	$ 322
Foreign Tax Authority [Member] | U.K. [Member]
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards period expiration, description	Indefinite
Net Operating Loss Carryforwards, Amount	$ 253
Other Foreign [Member]
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards period expiration, description	Various
Net Operating Loss Carryforwards, Amount	$ 323