Consolidated Statements Of Equity (Parenthetical) - $ / shares	3 Months Ended
Jun. 30, 2018	Mar. 31, 2018
Consolidated Statements Of Equity [Abstract]
Dividends on preferred stock per share	$ 5.56	$ 5.56

Aggregate dividends declared during the period for each share of preferred stock outstanding.

No definition available.

Name:	us-gaap_PreferredStockDividendsPerShareDeclared
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration