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Credit Facilities (Detail) - USD ($)
Sep. 30, 2017
Sep. 22, 2017
Jun. 30, 2017
Bridge Loan [Member]      
Debt Instrument [Line Items]      
Maximum borrowing capacity   $ 2,000,000,000.0  
Line of Credit [Member] | Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Maximum borrowing capacity     $ 1,200,000,000.00
Line of credit, current $ 595,000,000