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Stock Plans - Narrative (Details) shares in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) installment shares | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of performance share units vest ranges | 0.00% |  |
Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of performance share units vest ranges | 200.00% |  |
Stock options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of annual installments of stock options | installment | 3 |  |
Maximum term of stock options | 10 years |  |
Compensation expense | $ 28 | $ 38 | $ 43
Deferred tax benefit related to compensation expense | 5 | 8 | 7
Unamortized compensation expense related to stock options | $ 23 |  |
Unamortized compensation expense recognition period | 1 year 4 months 24 days |  |
Restricted stock, deferred stock units and performance share units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense | $ 98 | 97 | 85
Deferred tax benefit related to compensation expense | $ 15 | $ 16 | $ 12
Unamortized compensation expense recognition period | 1 year 8 months 12 days |  |
Unamortized compensation expense related to deferred stock units, performance share units and restricted stock | $ 107 |  |
Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares award expiration date | May 21, 2024 |  |
Shares authorized to be issued under stock option plan (in shares) | shares | 243.7 |  |
Shares available to be granted (in shares) | shares | 53.2 |  |

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