| **Share-Based Payments - Narrative (Detail)**                                                   | 12 Months Ended |
|-------------------------------------------------------------------------------------------------|-----------------|
||
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**              |            |
| Shares available for award                                                                      | 494,000,000     |
| 2014 Stock Plan [Member]                                                                        |            |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**              |            |
| Number of additional shares authorized                                                          | 520,000,000     |
| Number of equity awards period                                                                  | 36 months       |
| Maximum shares available per individual during the plan period                                  | 20,000,000      |
| 2004 Stock Plan, Amended and Restated [Member]                                                  |            |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**              |            |
| Number of equity awards period                                                                  | 36 months       |
| Maximum shares available per individual during the plan period                                  | 8,000,000       |
| Restricted Stock Units (RSUs) [Member] | 2014 Stock Plan [Member]                               |            |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**              |            |
| Number of shares counted toward maximum                                                         | 3               |
| Restricted Stock Units (RSUs) [Member] | 2004 Stock Plan, Amended and Restated [Member]         |            |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**              |            |
| Number of shares counted toward maximum                                                         | 2               |
| Employee Stock Option [Member] | 2014 Stock Plan [Member]                                       |            |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**              |            |
| Number of shares counted toward maximum                                                         | 1               |
| Employee Stock Option [Member] | 2004 Stock Plan, Amended and Restated [Member]                 |            |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**              |            |
| Number of shares counted toward maximum                                                         | 1               |
| Portfolio Performance Shares [Member] | 2014 Stock Plan [Member]                                |            |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**              |            |
| Number of shares counted toward maximum                                                         | 3               |
| Portfolio Performance Shares [Member] | 2004 Stock Plan, Amended and Restated [Member]          |            |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**              |            |
| Number of shares counted toward maximum                                                         | 2,000,000       |
| Performance Shares [Member] | 2014 Stock Plan [Member]                                          |            |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**              |            |
| Number of shares counted toward maximum                                                         | 3               |
| Performance Shares [Member] | 2004 Stock Plan, Amended and Restated [Member]                    |            |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**              |            |
| Number of shares counted toward maximum                                                         | 2,000,000       |
| Total Shareholder Return Units (TSRU) [Member] | 2014 Stock Plan [Member]                       |            |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**              |            |
| Number of shares counted toward maximum                                                         | 1               |
| Total Shareholder Return Units (TSRU) [Member] | 2004 Stock Plan, Amended and Restated [Member] |            |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**              |            |
| Number of shares counted toward maximum                                                         | 1,000,000       |

| X                                                                                                                                                                                                                                                                                                                                                                                                |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Share Based Compensation Arrangement By Share Based Payment Award, Maximum Number of Awards Granted Per Employee
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Share Based Compensation Arrangement By Share Based Payment Award, Maximum Number of Awards Granted Per Employee, Period
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Share Based Compensation Arrangement By Share Based Payment Award, Shares Counted Toward Maximum Number of Awards Granted Per Employee
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                          |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of additional shares authorized for issuance under an established share-based compensation plan.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901
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| X                                                                                                                                     |
|---------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                       |
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| X                                                                                                                                                   |
|-----------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                               |
|-------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                  |
|----------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                             |
|-----------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                       |
|---------------------------------------------------------------------------------------------------------------------------------------------------------|
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