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Share-Based Compensation - Narrative (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Participating securities |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Intrinsic value of restricted stock, vested | $ 14 |
Unrecognized compensation expense | $ 30 |
Share-based compensation expense, weighted average period for recognition | 2 years 3 days |
Stock option |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based compensation expense, weighted average period for recognition | 1 year 4 months 20 days |
Unrecognized compensation expense | $ 9 |
Stock option | Management |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based compensation, award vesting period | 3 years |
Stock option | Management | Minimum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Expiration period | 7 years |
Stock option | Management | Maximum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Expiration period | 10 years |
Performance Share Units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based compensation, award vesting period | 3 years |
Performance Share Units | Minimum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Performance share units maximum payout percentage | 0.00% |
Performance Share Units | Maximum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Performance share units maximum payout percentage | 200.00% |
Performance Share Units | Management |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based compensation, award vesting period | 3 years |
Performance share units maximum payout percentage | 200.00% |
Performance share grant maximum payout percentage | 100.00% |
Terms of award | less than zero |
Performance Share Units | Management | Minimum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
TSR component percentage performance share units | 0.00% |
Operational component percentage performance share ufnits | 0.00% |
Performance Share Units | Management | Maximum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
TSR component percentage performance share units | 100.00% |
Operational component percentage performance share ufnits | 100.00% |
Cash Restricted Stock Units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based compensation, award vesting period |  | 3 years

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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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