.0 billion and was amended in april 2017 to extend the maturity date to april 2022 ( the 201c2017 credit facility 201d ) . the 2017 credit facility permits the company to request up to an additional $ 1.0 billion of borrowing capacity , subject to lender credit approval , increasing the overall size of the 2017 credit facility to an aggregate principal amount not to exceed $ 5.0 billion