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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2019
Share-based Payment Arrangement [Abstract] |
Stock option activity [Text Block] |
| Shares (thousands) |  | Weighted average exercise price |  | Weighted average remaining contractual life (in years) |  | Aggregate intrinsic value (in millions)
Outstanding at January 1, 2017 | 473 |  |  | $ | 17.47 |  |  | 0.1 |  | $ | 10.4 |
Exercised | (473 | ) |  | $ | 17.47 |  |  |  |  | $ | 10.4 |
Outstanding at December 31, 2017 | — |  |  | $ | — |  |  | 0.0 |  | $ | — |
Exercised | — |  |  | $ | — |  |  |  |  | $ | — |
Outstanding at December 31, 2018 | — |  |  | $ | — |  |  | 0.0 |  | $ | — |
Exercised | — |  |  | $ | — |  |  |  |  | $ | — |
Outstanding at December 31, 2019 | — |  |  | $ | — |  |  | 0.0 |  | $ | — |
Options exercisable at December 31, 2019 | — |  |  | $ | — |  |  | 0.0 |  | $ | — |
Cash Proceeds Received and Tax Benefit from Share-based Payment Awards [Table Text Block] |
| Year Ended December 31,
(in millions) | 2019 |  | 2018 |  | 2017
Proceeds from stock options exercised — gross | $ | — |  |  | $ | — |  |  | $ | 8 |
Tax benefit | — |  |  | — |  |  | 8 |
Proceeds from stock options exercised, net of tax | $ | — |  |  | $ | — |  |  | $ | 16 |
Restricted stock compensation expense [Text Block] |
| Year Ended December 31,
(in millions, except per share data) | 2019 |  | 2018 |  | 2017
Restricted stock compensation expense | $ | 30 |  |  | $ | 26 |  |  | $ | 27 |
Restricted stock compensation expense, net of tax | $ | 23 |  |  | $ | 20 |  |  | $ | 20 |
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] |
| Shares subject to restriction (thousands) |  | Weighted average grant date fair value
Nonvested at January 1, 2017 | 1,429 |  |  | $ | 44.12 |
Granted | 804 |  |  | $ | 40.10 |
Vested | (521 | ) |  | $ | 56.53 |
Forfeited | (119 | ) |  | $ | 38.97 |
Nonvested at December 31, 2017 | 1,593 |  |  | $ | 38.86 |
Granted | 737 |  |  | $ | 51.70 |
Vested | (556 | ) |  | $ | 42.25 |
Forfeited | (258 | ) |  | $ | 44.51 |
Nonvested at December 31, 2018 | 1,516 |  |  | $ | 42.97 |
Granted | 1,082 |  |  | $ | 41.66 |
Vested | (724 | ) |  | $ | 36.81 |
Forfeited | (210 | ) |  | $ | 44.82 |
Nonvested at December 31, 2019 | 1,664 |  |  | $ | 44.26 |
Share-based Payment Arrangement, Performance Shares, Activity [Table Text Block] |
| Year Ended December 31,
(in millions, except share data) | 2019 |  | 2018 |  | 2017
Expense | $ | 7 |  |  | $ | 18 |  |  | $ | 16 |
Number of shares | 315,000 |  |  | 249,000 |  |  | 126,000 |
A summary of the status of the Company’s nonvested relative revenue growth performance shares at December 31, 2019, 2018 and 2017 is as follows:
| Number of shares (thousands) |  | Weighted average grant date fair value
Nonvested at January 1, 2017 | 320 |  |  | $ | 38.62 |
Granted | 198 |  |  | $ | 40.08 |
Vested | (156 | ) |  | $ | 38.62 |
Forfeited | (7 | ) |  | $ | 39.20 |
Nonvested at December 31, 2017 | 355 |  |  | $ | 39.42 |
Granted | 287 |  |  | $ | 50.82 |
Vested | (166 | ) |  | $ | 38.62 |
Forfeited | (179 | ) |  | $ | 45.82 |
Nonvested at December 31, 2018 | 297 |  |  | $ | 47.03 |
Granted | 196 |  |  | $ | 41.90 |
Vested | (160 | ) |  | $ | 40.10 |
Forfeited | (93 | ) |  | $ | 44.30 |
Nonvested at December 31, 2019 | 240 |  |  | $ | 48.52 |
| Number of shares (thousands) |  | Weighted average grant date fair value
Nonvested at January 1, 2017 | 410 |  |  | $ | 43.99 |
Granted | 201 |  |  | $ | 45.57 |
Forfeited | (256 | ) |  | $ | 61.40 |
Nonvested at December 31, 2017 | 355 |  |  | $ | 32.35 |
Granted | 287 |  |  | $ | 68.38 |
Forfeited | (345 | ) |  | $ | 38.26 |
Nonvested at December 31, 2018 | 297 |  |  | $ | 60.35 |
Granted | 196 |  |  | $ | 51.52 |
Vested | (160 | ) |  | $ | 45.78 |
Forfeited | (93 | ) |  | $ | 55.82 |
Nonvested at December 31, 2019 | 240 |  |  | $ | 64.61 |
| Year Ended December 31,
(in millions, except share data) | 2019 |  | 2018 |  | 2017
Expense | $ | 5 |  |  | $ | 9 |  |  | $ | 10 |
Number of shares | — |  |  | — |  |  | — |

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