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Stock-Based Compensation - Additional Information (Detail) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
May 11, 2018 $ / shares shares | Feb. 28, 2018 Installment $ / shares shares | Sep. 30, 2018 USD ($) shares | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) shares | Sep. 30, 2017 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Authorized shares under stock based compensation |  |  | 69,400,000 |  | 69,400,000 |
Remaining shares available for future grants under the Plan |  |  | 10,253,618 |  | 10,253,618 |
Stock option granted |  | 1,610,599 |  |  |  |
Stock options granted fair value | $ / shares |  | $ 10.01 |  |  |  |
Stock options exercise price | $ / shares |  | $ 35.09 |  |  |  |
Stock-based compensation expense | $ |  |  | $ 30 | $ 33 | $ 88 | $ 85
Income tax benefit recognized | $ |  |  | $ 6 | 9 | $ 12 | 18
2018 Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Authorized shares under stock based compensation | 17,800,000 |  |  |  |  |
Remaining shares available for future grants under the Plan |  |  | 17,709,906 |  | 17,709,906 |
Stock-based compensation expense | $ |  |  | $ 30 | 33 | $ 88 | 85
Income tax benefit recognized | $ |  |  | $ 6 | $ 9 | $ 12 | $ 18
Stock Options and Stock Appreciation Rights (SARs) [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Fungible shares issuance ratio |  |  |  |  | 1 |
Stock Options and Stock Appreciation Rights (SARs) [Member] | 2018 Plan [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 |
Other Awards [Member] | 2018 Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Fungible shares issuance ratio | 2.5 |  |  |  |  |
Restricted Stock and Restricted Stock Units [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares granted |  | 2,391,933 |  |  |  |
Restricted stock granted fair value | $ / shares |  | $ 35.09 |  |  |  |
Number of equal annual vesting installments | Installment |  | 3 |  |  |  |
Period of option vested over grant date |  |  |  |  | The restricted stock and restricted stock units vest in three equal annual installments commencing on the first anniversary of the grant date. |
Performance-base restricted stock [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Description of performance goal |  |  |  |  | The performance share awards can be earned based on performance against established goals over a three-year performance period. |
Performance period |  |  |  |  | 3 years |
Performance-base restricted stock [Member] | Minimum [Member] | Senior Management Employees [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares granted |  | 0 |  |  |  |
Performance-base restricted stock [Member] | Maximum [Member] | Senior Management Employees [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares granted |  | 449,532 |  |  |  |
Stock Appreciation Rights (SARs) [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares granted |  | 14,228 |  |  |  |
Stock Options [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  | 3 years |  |  |  |
TSR Award [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Description of performance goal |  |  |  |  | The performance share awards are based entirely on a TSR (total shareholder return) goal. Performance against the TSR goal is determined by comparing the performance of the Company’s TSR with the TSR performance of the members of the OSX (Oil Service Sector) index for the three-year performance period. |
Restricted Stock Awards [Member] | 2018 Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares granted | 35,432 |  |  |  |  |
Restricted stock granted fair value | $ / shares | $ 40.65 |  |  |  |  |

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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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