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Stock Plans and Share-Based Compensation - Pre-tax Expense and Income Tax Benefits (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total Share-Based Compensation Expense | $ 13 | $ 20 | $ 72 | $ 32
Income Tax Benefit | 4 | 6 | 19 | 17
Performance Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total Share-Based Compensation Expense | 6 | 14 | 44 | 6
Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total Share-Based Compensation Expense | 3 | 3 | 13 | 16
Restricted Stock Units and Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total Share-Based Compensation Expense | 3 | 2 | 10 | 5
Employee Stock Purchase Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total Share-Based Compensation Expense | 1 | 1 | 3 | 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

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