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Combined Guarantor Subsidiaries - Revenues - Narrative (Details)
3 Months Ended
Mar. 31, 2019
extension_option
Condensed Financial Statements, Captions [Line Items]  
Period between increases in fixed rate of arrangements 5 years
Number of extension options available (one or more) 1
Period of extension option (50 or more years) 50 years
Guarantor Subsidiaries  
Condensed Financial Statements, Captions [Line Items]  
Period between increases in fixed rate of arrangements 5 years
Number of extension options available (one or more) 1
Period of extension option (50 or more years) 50 years