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Stock-Based Compensation - Additional Information (Detail) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
May 18, 2016 $ / shares shares | Feb. 24, 2016 $ / shares shares | Jun. 30, 2016 USD ($) shares | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) shares | Jun. 30, 2015 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Earlier authorized shares under stock based compensation |  |  | 69,400,000 |  |  |
Remaining shares available for future grants under the Plan |  |  | 31,391,412 |  | 31,391,412 |
Stock-based compensation expense | $ |  |  | $ 21 | $ 22 | $ 50 | $ 62
Income tax benefit recognized | $ |  |  | $ 5 | $ 6 | $ 12 | 13
Restricted Stock Awards [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Restricted stock granted | 44,520 |  |  |  |  |
Restricted stock granted fair value | $ / shares | $ 31.45 |  |  |  |  |
Period of option vested over grant date |  |  |  |  | The stock options vest over a three-year period from the grant date while the restricted stock and restricted stock units vest on the third anniversary of the date of grant. |
Restricted Stock and Restricted Stock Units [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Restricted stock granted |  | 1,732,095 |  |  |  |
Restricted stock granted fair value | $ / shares |  | $ 28.24 |  |  |  |
Stock Appreciation Rights (SARs) [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock appreciation rights, vesting period |  | 3 years |  |  |  |
Period of option vested over grant date |  |  |  |  | The SARs are cash-settled awards and vest over a three-year period from the grant date. |
Stock Options and Stock Appreciation Rights (SARs) [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Fungible shares issuance ratio |  |  |  |  | 1 |
Other Awards [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Fungible shares issuance ratio |  |  |  |  | 3 |
Stock Options [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock option granted |  | 3,672,411 |  |  |  |
Stock option granted fair value | $ / shares |  | $ 6.44 |  |  |  |
Stock Options [Member] | Restricted Stock Awards [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock option granted, exercise price | $ / shares |  | $ 28.24 |  |  |  |
Performance-base restricted stock [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Performance share awards, performance period |  | 3 years |  |  |  |
Performance-base restricted stock [Member] | Senior Management Employees [Member] | Stock Appreciation Rights (SARs) [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock option granted |  | 4,618,400 |  |  |  |
Stock option granted fair value | $ / shares |  | $ 6.44 |  |  |  |
Stock option granted, exercise price | $ / shares |  | $ 28.24 |  |  |  |
Performance-base restricted stock [Member] | Minimum [Member] | Senior Management Employees [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Restricted stock granted |  | 0 |  |  |  |
Performance-base restricted stock [Member] | Maximum [Member] | Senior Management Employees [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Restricted stock granted |  | 341,780 |  |  |  |
Voluntary Early Retirement Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation expense | $ |  |  |  |  | $ 5 | $ 18

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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://www.xbrl.org/2003/role/presentationRef -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=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made 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://www.xbrl.org/2003/role/presentationRef -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=6415400&loc=d3e5070-113901 + Details
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