Shareholders' Equity (Additional Information) (Details) - USD ($) $ / shares in Units, shares in Thousands	1 Months Ended	9 Months Ended
	May 31, 2020	Jun. 30, 2020	May 01, 2020
Minimum
Class of Stock [Line Items]
Convertible Preferred Stock, Shares Issued upon Conversion		5,200
Maximum
Class of Stock [Line Items]
Convertible Preferred Stock, Shares Issued upon Conversion		6,200
Convertible Preferred Stock
Class of Stock [Line Items]
Preferred Stock, Shares Outstanding			2,475
Stock Issued During Period, Shares, New Issues	1,500
Gross Proceeds from Issuance of Equity	$ 1,500,000,000
Proceeds from Issuance of Preferred Stock and Preference Stock	1,459,000,000
Preferred Stock, Dividend Rate, Percentage		6.00%
Depositary Share Liquidation		$ 50
Preferred Stock, Liquidation Preference Per Share		$ 1,000
Preferred Stock Depositary Share Ownership Interest, Percentage	$ 0.05
Common Stock  Issued at Par Value
Class of Stock [Line Items]
Convertible Preferred Stock, Shares Issued upon Conversion			11,703
Stock Issued During Period, Shares, New Issues	6,250
Proceeds from Issuance of Common Stock	$ 1,459,000,000
Gross Proceeds from Issuance of Equity	$ 1,500,000,000