Investment And Other Income (Loss), Net (Components Of Investment And Other Income (Loss)) (Details) - USD ($) $ in Millions	4 Months Ended	8 Months Ended	12 Months Ended
	Apr. 30, 2021	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2020
Investment And Other Income (Loss), Net [Abstract]
Interest and dividend income		$ 1	$ 42	$ 4
Pension benefit	6	52	75	(36)
OPEB costs	(4)	(50)	(18)	(7)
OPEB remeasurement gain			248
Pension remeasurement gain			218
All other, net	(1)	(8)	(11)	(4)
Investment and other income (loss), net	$ 1	$ (5)	$ 554	$ (43)