Recent Accounting Pronouncements - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2019	Apr. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease assets	$ 92
Present value of net minimum lease payments	$ 110
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease assets		$ 114
Present value of net minimum lease payments		$ 130