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Stock Plans and Share-Based Compensation - Share-Based Compensation (Benefit) Expense and Related Income Tax Benefit (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total Share-Based Compensation (Benefit) Expense | $ (12) | $ 17 | $ 12 | $ 30
Income Tax Benefit | 2 | 7 | 11 | 35
Performance Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total Share-Based Compensation (Benefit) Expense | (17) | 9 | (8) | 15
Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total Share-Based Compensation (Benefit) Expense | 3 | 5 | 13 | 7
Restricted Stock Units and Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total Share-Based Compensation (Benefit) Expense | 1 | 2 | 3 | 4
Employee Stock Purchase Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total Share-Based Compensation (Benefit) Expense | 1 | 1 | 2 | 2
Stock Awards for Directors |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total Share-Based Compensation (Benefit) Expense | $ 0 | $ 0 | $ 2 | $ 2

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