U.S. and Europe Retrospective Responsibility Plans - Additional Details (Details) € in Millions, $ in Millions	3 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2021 EUR (€)	Dec. 31, 2020 USD ($)
Class of Stock [Line Items]
VE covered loss, maximum amount of loss to allow adjustment of conversion rate during six-month period | €		€ 20
Recovery through conversion rate adjustment	$ 0		$ 0
Preferred Stock
Class of Stock [Line Items]
Recovery through conversion rate adjustment	$ 29		$ 15