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Stock Incentive Plans (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Share-based Compensation Activity |
| Shares (in millions) |  | Weighted-Average Grant Date Fair Value |  | Weighted-Average Remaining Contractual Term in Years
Units outstanding at January 1, 2018 | 52.9 |  |  | $ | 21.75 |  |  | 2.0
Granted | 13.7 |  |  | $ | 30.41 |  |  |
Settled | (10.2 | ) |  | $ | 30.23 |  |  |
Forfeited or expired | (8.3 | ) |  | $ | 29.51 |  |  |
Units outstanding at December 31, 2018(a) | 48.1 |  |  | $ | 19.81 |  |  | 1.3
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(a) | Includes the target amount of PSUs.

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