Stock Plans (Restricted Shares Outstanding) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	4 Months Ended	8 Months Ended			12 Months Ended
	Apr. 30, 2021	Aug. 31, 2022	Dec. 31, 2021	Aug. 31, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ (1)
Performance Stock [Member] | Granted In 2021 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock granted (in shares)		2,100					1,100
Restricted stock granted (in dollars per shares)				$ 30.85
Restricted stock forfeited (in dollars per shares)		$ 27.22
Performance Stock [Member] | Granted In 2022 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock granted (in shares)					200	200
Restricted stock granted (in dollars per shares)					$ 23.95	$ 26.81
2021 Incentive Plan [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Balance at beginning of period (in shares)		2,483			2,514	2,483
Restricted stock granted (in shares)			2,578		1,373	1,104
Restricted stock vested (in shares)			(21)		(1,225)	(892)
Restricted stock forfeited (in shares)			(74)		(194)	(181)
Balance at end of period (in shares)			2,483		2,468	2,514	2,483
Balance at beginning of period (in dollars per shares)		$ 28.67			$ 25.78	$ 28.67
Restricted stock granted (in dollars per shares)			$ 28.66		23.11	25.80
Restricted stock vested (in dollars per shares)			28.44		25.77	25.81
Restricted stock forfeited (in dollars per shares)			28.52		24.97	25.88
Balance at end of period (in dollars per shares)			$ 28.67		$ 24.37	$ 25.78	$ 28.67
Balance at beginning of period		$ 72			$ 64	$ 72
Restricted stock granted			$ 75		35	28
Restricted stock vested					(31)	(23)
Balance at end of period			$ 72		$ 63	$ 64	$ 72
2021 Incentive Plan [Member] | Performance Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Balance at beginning of period (in shares)		3,144			3,485	3,144
Restricted stock granted (in shares)			3,157		1,040	388
Restricted stock forfeited (in shares)			(13)		(38)	(47)
Balance at end of period (in shares)			3,144		4,487	3,485	3,144
Balance at beginning of period (in dollars per shares)		$ 25.62			$ 25.62	$ 25.62
Restricted stock granted (in dollars per shares)					24.36
Restricted stock forfeited (in dollars per shares)			25.61
Balance at end of period (in dollars per shares)			$ 25.62		$ 25.33	$ 25.62	$ 25.62
2017 EIP [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Balance at beginning of period (in shares)	304		154	304			304
Restricted stock vested (in shares)	(41)
Restricted stock forfeited (in shares)	(109)
Balance at end of period (in shares)	154
Cancellation of restricted stock (in shares)	(154)
Balance at beginning of period (in dollars per shares)			$ 5.38
Restricted stock vested (in dollars per shares)	$ 8.23
Restricted stock forfeited (in dollars per shares)	8.23
Balance at end of period (in dollars per shares)	$ 5.38