summary Of Significant Accounting Policies - (Schedule of Components of Investments) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Summary Of Significant Accounting Policies [Line Items]
Investments	$ 416	$ 402
Catalyst [Member]
Summary Of Significant Accounting Policies [Line Items]
Investments	$ 361	368
Percentage Of Interest In Investments	50.00%
Other Member
Summary Of Significant Accounting Policies [Line Items]
Investments	$ 55	$ 34