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Stock-Based Compensation (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares reserved for future issuance (in shares) | 3,000,000 |  |
Non-employee directors |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense | $ 1 |  |
Stock options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock options granted (in shares) |  | 0 | 0
Time-vested restricted stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period (in years) for shares awarded | 3 years |  |
Performance-based shares |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period (in years) for shares awarded | 3 years |  |
Award vesting period | 3 years |  |
Level of performance achieved based on shares awarded, minimum | 0.00% |  |
Level of performance achieved based on shares awarded, maximum | 200.00% |  |
Time-vested restricted stock and deferred stock | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 3 years |  |
Time-vested restricted stock and deferred stock | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 5 years |  |
Restricted stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation cost | $ 72 |  |
Weighted average recognition period, in years | 3 years 5 months |  |
Aggregate market value of the shares released and issued on the vesting dates | $ 16 |  |

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