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Debt - Corporate Credit Facility (Details) - Credit Facilities - Revolving Credit Facility - JPMorgan Chase Bank, N.A.
12 Months Ended
Jan. 10, 2017
USD ($)
extension
Dec. 31, 2018
USD ($)
Line of Credit Facility [Line Items]    
Maximum principal amount of credit facility $ 1,000,000,000.0  
Number of extension options | extension 2  
Extension term 6 months  
Extension commitment fee 0.10%  
Maximum amount available for draw   $ 1,000,000,000.0
Percentage of unused amount   0.35%
Minimum    
Line of Credit Facility [Line Items]    
Percentage of unused amount   0.25%
Maximum    
Line of Credit Facility [Line Items]    
Percentage of unused amount   0.35%
LIBOR    
Line of Credit Facility [Line Items]    
Basis spread on variable rate, percent   2.25%
Base Rate    
Line of Credit Facility [Line Items]    
Basis spread on variable rate, percent   1.25%
Accordion Feature    
Line of Credit Facility [Line Items]    
Maximum principal amount increase $ 1,500,000,000.0