Subsequent Event Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Preferred Stock Tender Offer Maximum	$ 60
Preferred Stock, Par Value Per Share	$ 1.00	$ 1.00
Preferred Stock Tender Offer Per Share	954.59
Preferred Stock, Liquidation Preference Per Share	$ 1,272.78
Preferred Stock Tender Offer Maximum Shares	62,854

The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share.

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant