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Share-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Pretax compensation expense | $ 22 | $ 20 | $ 8
Performance Cash Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance stock units vesting rule measurement period | 3 years | 3 years | 3 years
RSUs |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share Based Compensation Estimated Forfeiture Rate Non Officers | 11.95% |  |
Period of straight-line expense - RSU's | 3 years |  |
Pretax compensation expense | $ 10 | $ 11 | $ 17
Award vesting period | 3 years | 3 years | 3 years
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ 10 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition | 1 year 9 months 18 days |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ 13.73 | $ 10.80 |
Weighted Average Grant Date Fair Value | $ 17.53 |  |
Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Related To Current Current Year Grants Per Year | $ 10 |  |
Stock Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock option grant price as percent of market price | 100.00% | 100.00% | 100.00%
Award vesting period | 3 years | 3 years | 3 years
Stock option contractual term | 10 years | 10 years | 10 years
Weighted Average [Member] | RSUs |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ 17.53 | $ 10.55 | $ 11.93
Minimum | PSUs |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Award Payout Range | 0.00% | 0.00% | 0.00%
Maximum | PSUs |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Award Payout Range | 200.00% | 200.00% | 200.00%

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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + 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 (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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