Stock Plans (Restricted Shares Outstanding) (Details) - Restricted Stock [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	4 Months Ended	8 Months Ended	12 Months Ended
	Apr. 30, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
2021 Incentive Plan [Member] | Successor [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock granted (in shares)		2,578
Restricted stock vested (in shares)		(21)
Restricted stock forfeited (in shares)		(74)
Balance at end of period (in shares)		2,483
Restricted stock granted (in dollars per shares)		$ 28.66
Restricted stock vested (in dollars per shares)		28.44
Restricted stock forfeited (in dollars per shares)		28.52
Balance at end of period (in dollars per shares)		$ 28.67
Restricted stock granted		$ 75
Balance at end of period		$ 72
2017 EIP [Member] | Predecessor [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Balance at beginning of period (in shares)	304	154	900	1,858
Restricted stock granted (in shares)				105
Restricted stock vested (in shares)	(41)		(387)	(1,039)
Restricted stock forfeited (in shares)	(109)		(209)	(24)
Balance at end of period (in shares)	154		304	900
Cancellation of restricted stock (in shares)	(154)
Balance at beginning of period (in dollars per shares)	$ 6.78	$ 5.38	$ 10.57	$ 16.02
Restricted stock granted (in dollars per shares)			0.00	2.00
Restricted stock vested (in dollars per shares)	8.23		15.04	19.05
Restricted stock forfeited (in dollars per shares)	8.23		7.79	28.30
Balance at end of period (in dollars per shares)	$ 5.38		$ 6.78	$ 10.57
Balance at beginning of period			$ 1	$ 4
Restricted stock vested				(1)
Balance at end of period				$ 1