| **Share-Based Payments - Impact on Net Income (Detail) - 2004 Stock Plan, Amended and Restated [Member] - USD ($) $ in Millions** | 12 Months Ended |
|-----------------------------------------------------------------------------------------------------------------------------------|-----------------|
||
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                                |            |   |   |
| Share-based payment expense                                                                                                       | $ 669           | $ 586 | $ 523 |
| Tax benefit for share-based compensation expense                                                                                  | (198)           | (179) | (173) |
| Share-based payment expense, net of tax                                                                                           | 471             | 407 | 350 |
| Restricted Stock Units (RSUs) [Member]                                                                                            |            |   |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                                |            |   |   |
| Share-based payment expense                                                                                                       | 306             | 270 | 249 |
| Employee Stock Option [Member]                                                                                                    |            |   |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                                |            |   |   |
| Share-based payment expense                                                                                                       | 165             | 150 | 140 |
| Portfolio Performance Shares [Member]                                                                                             |            |   |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                                |            |   |   |
| Share-based payment expense                                                                                                       | 147             | 96 | 56 |
| Total Shareholder Return Units (TSRU) [Member]                                                                                    |            |   |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                                |            |   |   |
| Share-based payment expense                                                                                                       | 36              | 37 | 37 |
| Performance Shares [Member]                                                                                                       |            |   |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                                |            |   |   |
| Share-based payment expense                                                                                                       | 11              | 30 | 34 |
| Directors' compensation [Member]                                                                                                  |            |   |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                                |            |   |   |
| Share-based payment expense                                                                                                       | $ 4             | $ 3 | $ 7 |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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=d3e301413-122809Reference 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=d3e5047-113901Reference 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=d3e5070-113901Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of expense, net of income tax, 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
No definition available.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.
+ References
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| - 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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