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Stock Plans and Share-Based Compensation - Share-Based Compensation and Related Income Tax Benefit (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total Share-based Compensation Expense | $ 107 | $ 29 | $ 74
Income Tax Benefit | 23 | 19 | 43
Performance Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total Share-based Compensation Expense | 71 | (3) | 42
Stock Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total Share-based Compensation Expense | 18 | 19 | 18
Restricted Stock Units and Awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total Share-based Compensation Expense | 12 | 6 | 8
Employee Stock Purchase Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total Share-based Compensation Expense | 4 | 5 | 4
Stock Awards for Directors |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total Share-based Compensation Expense | $ 2 | $ 2 | $ 2

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