Intangible Assets (Details 1) $ in Millions	Jun. 30, 2015 USD ($)
Estimated annual amortization expense intangible assets
Estimated future amortization expense, 2015	$ 4
Estimated future amortization expense, 2016	7
Estimated future amortization expense, 2017	2
Estimated future amortization expense, 2018 and thereafter	$ 1