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Compensation Plans - Stock Based Compensation (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | May 01, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total share-based compensation expense recognized | $ 21 | $ 18 | $ 15 |
Deferred compensation cost | $ 29 |  |  |
Total unrecognized compensation cost, period of recognition | 2 years |  |  |
Executive Vice President |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total share-based compensation expense recognized |  | $ 1 |  |
Former Chairman, Chief Executive Officer and President |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total share-based compensation expense recognized |  |  | $ 2 |
2006 Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Maximum number of shares available for future awards (in shares) |  |  |  | 0
2014 Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Maximum number of shares available for future awards (in shares) | 27,000,000 |  |  |
Maximum number of shares reserved for awards (in shares) |  |  |  | 33,000,000
Maximum number of shares available for future awards to be issued as restricted stock and performance restricted stock unit (in shares) | 18,000,000 |  |  |

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