Investment and Other Income (Loss), Net (Narrative) (Details) - USD ($) $ in Millions	4 Months Ended	12 Months Ended
	Apr. 30, 2021	Dec. 31, 2023	Dec. 31, 2022
Investment and Other Income (Loss), Net [Abstract]
Pension remeasurement gain		$ 202	$ 218
OPEB remeasurement (loss) gain		$ (3)	$ 248