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Debt Facilities - Senior Credit Facility and Revolving Facility (Detail) - Revolving credit facility borrowings - USD ($)
12 Months Ended
Dec. 12, 2017
Dec. 31, 2019
Letter of Credit    
Debt Instrument [Line Items]    
Maximum borrowing capacity   $ 250,000,000.0
Letter of Credit | Minimum    
Debt Instrument [Line Items]    
Margin rate (percent)   0.00%
Quarterly facility fee (percent)   0.15%
Letter of Credit | Maximum    
Debt Instrument [Line Items]    
Margin rate (percent)   0.40%
Quarterly facility fee (percent)   0.30%
Letter of Credit | LIBOR | Minimum    
Debt Instrument [Line Items]    
Variable rate (percent)   0.85%
Letter of Credit | LIBOR | Maximum    
Debt Instrument [Line Items]    
Variable rate (percent)   1.40%
Letter of Credit | Federal Funds Rate    
Debt Instrument [Line Items]    
Variable rate (percent)   0.50%
Letter of Credit | One month LIBOR    
Debt Instrument [Line Items]    
Variable rate (percent)   1.00%
Senior Credit Facility    
Debt Instrument [Line Items]    
Maximum borrowing capacity $ 3,000,000,000.0  
Debt instrument, term 5 years  
Revolving Credit Facility    
Debt Instrument [Line Items]    
Maximum borrowing capacity $ 2,000,000,000.0  
Term Loan Facility    
Debt Instrument [Line Items]    
Maximum borrowing capacity $ 1,000,000,000.0