Combined Guarantor Subsidiaries - Revenues - Narrative (Details) - Guarantor Subsidiaries	12 Months Ended
Dec. 31, 2019 extension_option
Disaggregation Of Revenue [Line Items]
Period between increases in fixed rate of arrangements	5 years
Number of extension options (one or more)	1
Period of extension option (50 or more years)	50 years

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_DisaggregationOfRevenueLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration