Commitments, Contingencies and Off-Balance Sheet Arrangements Commitments, Contingencies and Off Balance Sheet Arrangements - Agreements (Details) - USD ($) $ in Millions		6 Months Ended
	Mar. 21, 2013	Sep. 08, 2018
Other Commitments [Line Items]
Professional Services Agreement, Base Amount		$ 30
Services Revenues [Member]
Other Commitments [Line Items]
Proceeds from Aggregate Fees	$ 50
Incremental Aggregate Fees	$ 6