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Compensation Plans - Stock Options (Details) - USD ($) shares in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of stock options shares exercisable (in shares) | 0.4 | 0.5 |
Total share-based compensation expense recognized | $ 23,000,000 | $ 21,000,000 | $ 18,000,000
Common Stock Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of stock options shares outstanding (in shares) | 0.4 | 0.5 |
Proceeds received from options exercised | $ 3,000,000 | $ 2,000,000 | 5,000,000
Total share-based compensation expense recognized | $ 0 | $ 0 | $ 0

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