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Stock-Based Compensation - Additional Information (Detail) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
May 18, 2016 $ / shares shares | Feb. 24, 2016 $ / shares shares | Sep. 30, 2016 USD ($) shares | Jun. 30, 2016 shares | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) shares | Sep. 30, 2015 USD ($)
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 |  |  | 31,772,300 |  |  | 31,772,300 |
Stock-based compensation expense | $ |  |  | $ 28 |  | $ 21 | $ 78 | $ 83
Income tax benefit recognized | $ |  |  | $ 5 |  | $ 7 | $ 17 | 20
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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