Stock Plans (Restricted Shares Outstanding) (Details) - 2021 Incentive Plan [Member] $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2023 USD ($) $ / shares shares
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Balance at beginning of period (in shares) | shares	2,514
Restricted stock granted (in shares) | shares	1,189
Restricted stock vested (in shares) | shares	(328)
Restricted stock forfeited (in shares) | shares	(44)
Balance at end of period (in shares) | shares	3,331
Balance at beginning of period (in dollars per shares) | $ / shares	$ 25.78
Restricted stock granted (in dollars per shares) | $ / shares	23.73
Restricted stock vested (in dollars per shares) | $ / shares	25.94
Restricted stock forfeited (in dollars per shares) | $ / shares	25.92
Balance at end of period (in dollars per shares) | $ / shares	$ 25.04
Balance at beginning of period | $	$ 64
Restricted stock granted | $	26
Restricted stock vested | $	(7)
Restricted stock forfeited | $
Balance at end of period | $	$ 73
Performance Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Balance at beginning of period (in shares) | shares	3,485
Restricted stock granted (in shares) | shares	988
Restricted stock forfeited (in shares) | shares	(11)
Balance at end of period (in shares) | shares	4,462
Balance at beginning of period (in dollars per shares) | $ / shares	$ 25.62
Restricted stock granted (in dollars per shares) | $ / shares	24.30
Restricted stock forfeited (in dollars per shares) | $ / shares	26.14
Balance at end of period (in dollars per shares) | $ / shares	$ 25.33