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Stock-Based Compensation Plans and Arrangements (Tables)
 12 Months Ended
Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]  
Schedule of Stock Option Activity The following table summarizes stock option activity for the year ended December 31, 2023.
 
(Dollars in thousands, shares and per share amounts in actuals)Number of
Options		Weighted
Average
Exercise
Price per
Share		Weighted
Average
Remaining
Contractual
Term
Aggregate
Intrinsic
Value(1)
Outstanding at December 31, 20221,066,197 $17.59 
Granted— — 
Exercised(2)
— — 
Canceled— — 
Outstanding at December 31, 2023(3)
1,066,197 $17.59 0.2 years$1,629 
Exercisable at December 31, 2023— $— — $— 
    
(1)The aggregate intrinsic value represents the total intrinsic value (the aggregate difference between our closing stock price on December 31, 2023 and the exercise price of in-the-money options) that would have been received by the option holders if all in-the-money options had been exercised on December 31, 2023.
(2)No options were exercised in the years ended December 31, 2023 and 2022. The total intrinsic value of options exercised was $2 million for the year ended December 31, 2021.
(3)For net-settled options, gross number is reflected.
Schedule of Restricted Stock Activity
The following table summarizes restricted stock activity for the year ended December 31, 2023.
 
(Shares and per share amounts in actuals)Number of
Shares		Weighted
Average Grant
Date
Fair Value
Non-vested at December 31, 202279,710 $15.68 
Granted83,479 16.47 
Vested(1)
(79,710)15.68 
Canceled— — 
Non-vested at December 31, 2023(2)
83,479 $16.47 
(1)The total fair value of shares that vested during the years ended December 31, 2023, 2022, and 2021 was $1 million, $1 million, and $1 million, respectively.
(2)As of December 31, 2023, there was $0.6 million of unrecognized compensation cost related to restricted stock, which is expected to be recognized over a weighted average period of 0.5 years.
Schedule of Restricted Stock Unit and Performance Stock Unit Activity
The following table summarizes RSU and PSU activity for the year ended December 31, 2023.

 
(Shares and per share amounts in actuals)Number of
RSUs/
PSUs		Weighted
Average Grant
Date
Fair Value
Outstanding at December 31, 20224,248,945 $15.44 
Granted2,932,239 14.30 
Vested and converted to common stock(1)
(2,746,671)12.68 
Canceled(87,519)16.63 
Outstanding at December 31, 2023(2)
4,346,994 $16.39 
(1)The total fair value of RSUs/PSUs that vested and converted to common stock during the years ended December 31, 2023, 2022, and 2021 was $35 million, $34 million, and $31 million, respectively.
(2)As of December 31, 2023, there was $21 million of unrecognized compensation cost related to RSUs/PSUs, which is expected to be recognized over a weighted average period of 1.5 years.
Summary of Black-Scholes Model Assumptions for Calculating ESPP Fair Values
The fair values of the stock purchase rights of the ESPP offerings were calculated using a Black-Scholes option pricing model with the following weighted average assumptions:

 
Years ended December 31, (per share amounts in actuals)202320222021
Risk-free interest rate5.31 %3.02 %0.07 %
Expected volatility38 %39 %34 %
Expected dividend rate2.73 %2.78 %0.66 %
Expected life of the option1 year1 year1 year
Weighted average fair value of stock purchase rights$4.14 $4.17 $4.93