Contingencies (Shareholder Class Action and Shareholder Derivative Lawsuits) (Details) - USD ($) $ in Millions	1 Months Ended			3 Months Ended	12 Months Ended
	Apr. 30, 2023	Oct. 31, 2022	Jan. 31, 2022	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2020
Loss Contingencies [Line Items]
Litigation settlement				$ 90
Provision related to litigation recorded						$ 90
Payments for legal settlements			$ 90
Loss contingency accrual				$ 91	$ 71	$ 91	$ 346		$ 9
Federal And State Shareholder Derivative Lawsuits [Member]
Loss Contingencies [Line Items]
Provision related to litigation recorded					$ 27
Loss contingency, settlement funding amount		$ 100
Loss contingency, settlement funding period		5 years
Loss contingency accrual								$ 100
Judgments paid (approximately)	$ 15