Stock-Based Compensation Plans - Status and Activity of Stock Options (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) $ / shares shares
Shares [Roll Forward]
Outstanding at beginning of period (in shares) | shares	2,046,236
Granted (in shares) | shares	171,000
Exercised (in shares) | shares	(378,522)
Forfeited or expired (in shares) | shares	(178,950)
Outstanding at end of period (in shares) | shares	1,659,764
Exercisable at end of period (in shares) | shares	1,488,764
Exercisable and expected to vest at end of period (in shares) | shares	1,659,764
Weighted- Average Exercise Price (per share)
Outstanding at beginning of period (in USD per share) | $ / shares	$ 25.98
Granted (in USD per share) | $ / shares	23.47
Exercised (in USD per share) | $ / shares	17.56
Forfeited or expired (in USD per share) | $ / shares	47.53
Outstanding at end of period (in USD per share) | $ / shares	25.31
Exercisable at end of period (in USD per share) | $ / shares	25.53
Exercisable and expected to vest at end of a period (in USD per share) | $ / shares	$ 25.31
Weighted- Average Remaining Contractual Term (in years)
Outstanding at end of period	3 years 6 months 3 days
Exercisable at end of period	3 years 1 month 9 days
Exercisable and expected to vest at end of period	3 years 1 month 9 days
Aggregate Intrinsic Value
Outstanding at end of period | $	$ 4
Exercisable at end of period | $	3
Exercisable and expected to vest at end of period | $	$ 4