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Stock Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Status of nonvested restricted stock |  |
Net impact due to stock awards modification | $ 2 | $ 0
Restricted Stock [Member] |  |
Restricted stock compensation expense |  |
Restricted stock compensation expense | 7 | 7
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options | $ 57 |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition | 2 years 3 months 18 days |
Status of nonvested restricted stock |  |
Nonvested shares subject to restriction, Beginning Balance | 1,516,000 |
Nonvested shares subject to restriction, weighted average exercise price | $ 42.97 |
Restricted shares granted to employees | 930,338 |
Granted shares subject to restriction, weighted average exercise price | $ 41.92 |
Shares subject to restriction, Vested | (665,000) |
Vested shares subject to restriction, weighted average exercise price | $ 35.94 |
Shares subject to restriction, Forfeited | (6,000) |
Forfeited shares subject to restriction, weighted average exercise price | $ 45.41 |
Nonvested shares subject to restriction, Ending Balance | 1,775,000 |
Nonvested shares subject to restriction, weighted average exercise price | $ 44.77 |
Performance Shares [Member] |  |
Status of nonvested restricted stock |  |
Nonvested shares subject to restriction, Beginning Balance | 297,000 |
Nonvested shares subject to restriction, weighted average exercise price | $ 60.35 |
Restricted shares granted to employees | 190,000 |
Granted shares subject to restriction, weighted average exercise price | $ 51.52 |
Shares subject to restriction, Forfeited | (9,000) |
Forfeited shares subject to restriction, weighted average exercise price | $ 55.30 |
Nonvested shares subject to restriction, Ending Balance | 478,000 |
Nonvested shares subject to restriction, weighted average exercise price | $ 56.93 |
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 | 297,000 |
Nonvested shares subject to restriction, weighted average exercise price | $ 47.03 |
Restricted shares granted to employees | 190,000 |
Granted shares subject to restriction, weighted average exercise price | $ 41.90 |
Shares subject to restriction, Forfeited | (9,000) |
Forfeited shares subject to restriction, weighted average exercise price | $ 44.12 |
Nonvested shares subject to restriction, Ending Balance | 478,000 |
Nonvested shares subject to restriction, weighted average exercise price | $ 45.04 |
Performance share compensation expense | $ (1) | $ 7
2018 Stock Incentive Plan [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of shares authorized | 7,000,000 |
Number of shares available for grant | 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 |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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