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Stock-Based Compensation - Narrative (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Aggregate maximum of common shares (in shares) | 20 |  | 20 |
Common shares available for grant (in shares) | 16 |  | 16 |
Stock-based compensation expense | $ 34 | $ 51 | $ 99 | $ 117
Stock Options, SARs and ESPP |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense related to stock options, SAR and ESPP grants | 11 | 20 | 28 | 39
Unrecognized compensation expense | 38 |  | $ 38 |
Weighted average period over which unrecognized compensation expense will be recognized (in years) |  |  | 1 year 8 months 12 days |
Restricted Stock And Restricted Stock Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation expense | 313 |  | $ 313 |
Weighted average period over which unrecognized compensation expense will be recognized (in years) |  |  | 2 years |
Share-based compensation arrangement by restricted stock and restricted stock units compensation cost | 18 | 20 | $ 63 | 65
Performance Unit |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation expense | 20 |  | $ 20 |
Weighted average period over which unrecognized compensation expense will be recognized (in years) |  |  | 1 year 9 months 18 days |
Performance period for performance units and shares (in years) |  |  | 3 years |
Minimum performance multiple at the completion of the performance period (as a percent) |  |  | 0.00% |
Maximum performance multiple at the completion of the performance period (as a percent) |  |  | 200.00% |
Average return on capital employed (in years) |  |  | 3 years |
Maximum performance multiple at the completion of the performance period if TSR is negative (as a percent) |  |  | 100.00% |
Stock-based compensation expense | $ 5 | $ 11 | $ 8 | $ 13
Performance Unit | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Modifier applied to performance based multiple |  |  | (70.00%) |
Performance Unit | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Modifier applied to performance based multiple |  |  | 70.00% |

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