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Shareholders' Equity - Share-based Compensation, Awards, Intrinsic Value, Cash Received and Tax Benefit (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Restricted Stock Units (RSUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total Intrinsic Value | $ 20 | $ 3 | $ 1
Cash Received | 0 | 0 | 0
Tax Benefit - RSU and PS awards | 4 | 1 | 0
Performance Shares [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total Intrinsic Value | 18 | 25 | 0
Cash Received | 0 | 0 | 0
Tax Benefit - RSU and PS awards | 4 | 10 | 0
Stock Options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total Intrinsic Value - Stock Options | 2 | 3 | 3
Cash Received | 2 | 6 | 9
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options | $ 0 | $ 1 | $ 1

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