Leases (Supplemental Cash Flow Information Related To Leases) (Details) - USD ($) $ in Millions	4 Months Ended	8 Months Ended	12 Months Ended
	Apr. 30, 2021	Dec. 31, 2021	Dec. 31, 2023	Dec. 31, 2022
Leases [Abstract]
Operating cash flows provided by operating leases	$ 21	$ 63	$ 62	$ 63
Operating cash flows used by operating leases	(14)	(38)	(61)	(62)
Operating cash flows used by finance leases	(5)	(6)	(15)	(9)
Financing cash flows used by finance leases	(7)	(13)	(25)	(19)
Right-of-use assets obtained in exchange for lease liabilities, Operating leases	$ 8	10	36	44
Right-of-use assets obtained in exchange for lease liabilities, Finance leases		$ 25	$ 60	$ 4