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Stock-Based Compensation - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2017 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Director deferred stock ownership plan amount to be credited to deferred stock accounts (as a percent) | 50.00% |  |
Share delivery term if elected | 5 years |  |
Award vesting period | 3 years |  |
Stock options granted (shares) | 0 | 0 |
Total fair value of stock options, vested | $ 3 | $ 4 | $ 5
Employee Stock Option |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 4 years |  |
Award expiration period | 10 years |  |
Employee Stock Option | Graded Vesting Method |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 4 years |  |
Employee Stock Option | Ratable Vest One |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award cost recognition period | 12 months |  |
Employee Stock Option | Ratable Vest Two |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award cost recognition period | 24 months |  |
Employee Stock Option | Ratable Vest Three |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award cost recognition period | 36 months |  |
Employee Stock Option | Ratable Vest Four |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award cost recognition period | 48 months |  |

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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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