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Share-Based Compensation - Share-Based Compensation and Related Income Tax Benefit (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total Share-Based Compensation Expense | $ 17 | $ 12 | $ 30 | $ 25
Income Tax Benefit | 7 | 9 | 35 | 17
Performance Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total Share-Based Compensation Expense | 9 | 8 | 15 | 14
Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total Share-Based Compensation Expense | 5 | 2 | 7 | 6
Restricted Stock Units and Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total Share-Based Compensation Expense | 2 | 2 | 4 | 3
Stock Awards for Directors |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total Share-Based Compensation Expense | 0 | 0 | 2 | 2
Employee Stock Purchase Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total Share-Based Compensation Expense | $ 1 | $ 0 | $ 2 | $ 0

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