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Stock Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Status of nonvested restricted stock |  |  |  |  |
Net impact due to stock awards modification | $ 0 |  | $ (4) | $ 2 | $ (4)
Restricted Stock [Member] |  |  |  |  |
Restricted stock compensation expense |  |  |  |  |
Restricted stock compensation expense | 7 |  | 5 | 14 | 12
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options | $ 53 |  |  | $ 53 |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  |  |  | 2 years 1 month 6 days |
Status of nonvested restricted stock |  |  |  |  |
Nonvested shares subject to restriction, Beginning Balance | 1,775,000 | 1,516,000 |  | 1,516,000 |
Nonvested shares subject to restriction, weighted average exercise price | $ 44.77 | $ 42.97 |  | $ 42.97 |
Restricted shares granted to employees | 125,000 | 930,000 |  | 1,031,513 |
Granted shares subject to restriction, weighted average exercise price | $ 40.78 | $ 41.92 |  |  |
Shares subject to restriction, Vested | (28,000) | (665,000) |  |  |
Vested shares subject to restriction, weighted average exercise price | $ 50.43 | $ 35.94 |  |  |
Shares subject to restriction, Forfeited | (37,000) | (6,000) |  |  |
Forfeited shares subject to restriction, weighted average exercise price | $ 45.13 | $ 45.41 |  |  |
Nonvested shares subject to restriction, Ending Balance | 1,835,000 | 1,775,000 |  | 1,835,000 |
Nonvested shares subject to restriction, weighted average exercise price | $ 44.40 | $ 44.77 |  | $ 44.40 |
Performance Shares [Member] |  |  |  |  |
Status of nonvested restricted stock |  |  |  |  |
Nonvested shares subject to restriction, Beginning Balance | 478,000 | 297,000 |  | 297,000 |
Nonvested shares subject to restriction, weighted average exercise price | $ 56.93 | $ 60.35 |  | $ 60.35 |
Restricted shares granted to employees | 5,000 | 190,000 |  |  |
Granted shares subject to restriction, weighted average exercise price | $ 51.59 | $ 51.52 |  |  |
Shares subject to restriction, Forfeited | (56,000) | (9,000) |  |  |
Forfeited shares subject to restriction, weighted average exercise price | $ 55.67 | $ 55.30 |  |  |
Nonvested shares subject to restriction, Ending Balance | 427,000 | 478,000 |  | 427,000 |
Nonvested shares subject to restriction, weighted average exercise price | $ 57.03 | $ 56.93 |  | $ 57.03 |
Performance share compensation expense |  |  |  | $ 3 | 2
Relative Revenue Growth Performance Share Plans [Member] |  |  |  |  |
Status of nonvested restricted stock |  |  |  |  |
Nonvested shares subject to restriction, Beginning Balance | 478,000 | 297,000 |  | 297,000 |
Nonvested shares subject to restriction, weighted average exercise price | $ 45.04 | $ 47.03 |  | $ 47.03 |
Restricted shares granted to employees | 5,000 | 190,000 |  |  |
Granted shares subject to restriction, weighted average exercise price | $ 41.92 | $ 41.90 |  |  |
Shares subject to restriction, Forfeited | (56,000) | (9,000) |  |  |
Forfeited shares subject to restriction, weighted average exercise price | $ 44.24 | $ 44.12 |  |  |
Nonvested shares subject to restriction, Ending Balance | 427,000 | 478,000 |  | 427,000 |
Nonvested shares subject to restriction, weighted average exercise price | $ 45.11 | $ 45.04 |  | $ 45.11 |
Performance share compensation expense | $ 1 |  | $ 1 |  | $ 8
2018 Stock Incentive Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares authorized | 7,000,000 |  |  | 7,000,000 |
Number of shares available for grant | 6,000,000 |  |  | 6,000,000 |
First Half Vested | Restricted Stock [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Percent of awards vested |  |  |  | 50.00% |
Vesting period |  |  |  | 2 years |
Second Half Vested | Restricted Stock [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  |  |  | 3 years |
Director [Member] | Restricted Stock [Member] |  |  |  |  |
Status of nonvested restricted stock |  |  |  |  |
Restricted shares granted to employees |  |  |  | 23,880 |

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