Contingencies (Shareholder Class Action and Shareholder Derivative Lawsuits) (Details) $ in Millions	1 Months Ended			3 Months Ended	6 Months Ended	12 Months Ended
	Jan. 31, 2022 USD ($)	Apr. 30, 2021 claim	Aug. 31, 2020 shareholder	Dec. 31, 2019 shareholder	Mar. 31, 2021 shareholder	Dec. 31, 2021 USD ($)	Aug. 31, 2021 shareholder	Sep. 30, 2021 contract
Loss Contingencies [Line Items]
Loss contingency, number of shareholders filing class action lawsuits | shareholder				2
Litigation settlement						$ 90
Provision related to litigation recorded						$ 90
Loss contingency, number of shareholders filing derivative lawsuits | shareholder			2		3		6
Loss contingency, number of pending cases consolidated | claim		5
Loss contingency number of states with concluded hearings | contract								4
Subsequent Event [Member]
Loss Contingencies [Line Items]
Payments for legal settlements	$ 90