Changes in Capital Structure - Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Sep. 30, 2024		Mar. 31, 2024		Sep. 30, 2023
Class of Stock [Line Items]
Preferred stock, dividends declared (in usd per share)	$ 51.25		$ 51.25
Dividends per Series A Preferred Stock (in usd per share)	$ 51.25		$ 51.25		$ 52.96
Series A Preferred Stock dividends	$ 33	[1]	$ 33	[1]	$ 34	[2]
Series A Preferred Stock
Class of Stock [Line Items]
Dividends per Series A Preferred Stock (in usd per share)	$ 51.25		$ 51.25
Series A Preferred Stock dividends	$ 33		$ 33
Series A Preferred Stock | Preferred Stock
Class of Stock [Line Items]
Preferred stock, dividend rate, percentage	10.25%		10.25%

[1] Dividends per share of Series A Preferred Stock were $51.25 for each of the periods ended September 15 and March 15, 2024

[2] Dividend per share of Series A Preferred Stock was $52.96