Preferred Stock - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions		6 Months Ended
		Jun. 30, 2021	Dec. 31, 2020
Number of preferred stock shares authorized		50,000,000	50,000,000
Preferred stock issuance costs included in earnings computation	[1]	$ 5
Series M Preferred Stock [Member]
Preferred Stock, Shares Issued		30,000
Liquidation preference per share		$ 25,000
Preferred stock dividend rate fixed percentage		4.00%
Series I [Member]
Preferred stock issuance costs included in earnings computation		$ 5

[1] Represents stock issuance costs originally recorded in preferred stock upon the issuance of the Company’s Series I Preferred Stock that were reclassified to retained earnings on the date the Company announced its intent to redeem the outstanding shares.