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Stock Plans and Share-Based Compensation - Pre-tax Expense and Income Tax Benefits (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total Share-Based Compensation Expense | $ 27 | $ (12) | $ 59 | $ 12
Income Tax Benefit | 6 | 2 | 15 | 11
Performance Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total Share-Based Compensation Expense | 20 | (17) | 38 | (8)
Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total Share-Based Compensation Expense | 4 | 3 | 10 | 13
Restricted Stock Units and Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total Share-Based Compensation Expense | 2 | 1 | 7 | 3
Stock Awards for Directors |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total Share-Based Compensation Expense | 0 | 1 | 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 | $ 2

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