Debt And Related Expenses (Schedule of Net Financing Cost Components) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Debt Disclosure [Abstract]
Interest based on debt outstanding	$ 92	$ 105
Early retirement of debt		(20)
Interest income	(1)	(1)
Other	(6)	7
Total net financing costs	$ 85	$ 77