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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, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total Share-Based Compensation Expense | $ 13 | $ 27 | $ 49 | $ 59
Income Tax Benefit | 3 | 6 | 12 | 15
Performance Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total Share-Based Compensation Expense | 6 | 20 | 26 | 38
Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total Share-Based Compensation Expense | 3 | 4 | 10 | 10
Restricted Stock Units and Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total Share-Based Compensation Expense | 3 | 2 | 9 | 7
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 | $ 1 | $ 2 | $ 2

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