Income Taxes - Schedule of Income Tax Net Operating Loss Carryforwards (NOLs) (Gross, Net Uncertain Tax Benefits) (Detail) $ in Millions	Jun. 30, 2020 USD ($)
U.S. Federal | 2021 to 2037
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards, Amount	$ 552
U.S. Federal | Indefinite
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards, Amount	598
U.S. States
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards, Amount	887
Foreign Tax Authority | Australia
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards, Amount	627
Foreign Tax Authority | U.K.
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards, Amount	10
Other Foreign
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards, Amount	$ 435