Income Taxes - Schedule of Income Tax Carryforwards (Detail) - Jun. 30, 2015 - USD ($) $ in Millions	Total
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 7
Net operating loss carryforwards, Year of expiration	No expiration date
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforwards	$ 6
Tax Credit Carryforward, Year of expiration	No expiration date
Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 110
Tax Credit Carryforwards	$ 3
Internal Revenue Service (IRS) [Member] | Minimum [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards, Year of expiration	2022
Tax Credit Carryforward, Year of expiration	2019
Internal Revenue Service (IRS) [Member] | Maximum [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards, Year of expiration	2035
Tax Credit Carryforward, Year of expiration	2034
California Franchise Tax Board [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 33
California Franchise Tax Board [Member] | Minimum [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards, Year of expiration	2016
California Franchise Tax Board [Member] | Maximum [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards, Year of expiration	2034
Other States [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 15
Other States [Member] | Minimum [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards, Year of expiration	2016
Other States [Member] | Maximum [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards, Year of expiration	2034