Commitments and Contingencies (Narrative) (Detail) $ in Millions		9 Months Ended
	Jul. 09, 2019 USD ($)	Sep. 30, 2019 Lawsuits
Commitments And Contingencies [Line Items]
Other material lawsuits pending | Lawsuits		0
PREPA minimum settlement percentage		60.00%
PREPA Bondholders in RSA		90.00%
Fuel Line Lenders [Member]
Commitments And Contingencies [Line Items]
PREPA working capital | $	$ 700