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Share-Based Payments - Impact on Net Income (Detail) - 2004 Stock Plan, Amended and Restated [Member] - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based payment expense |  | $ 949.0 | $ 840.0 | $ 691.0
Tax benefit for share-based compensation expense | [1] | (180.0) | (163.0) | (205.0)
Share-based payment expense, net of tax |  | 769.0 | 677.0 | 486.0
Total Shareholder Return Units (TSRUs) [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based payment expense | [2] | 302.0 | 221.0 | 134.0
Restricted Stock Units (RSUs) [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based payment expense |  | 286.0 | 301.0 | 299.0
Portfolio Performance Shares [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based payment expense |  | 276.0 | 209.0 | 135.0
Performance Shares [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based payment expense |  | 62.0 | 47.0 | 13.0
Employee Stock Option [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based payment expense |  | 12.0 | 55.0 | 106.0
Directors' compensation [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based payment expense |  | 10.0 | $ 7.0 | $ 4.0
Performance Total Shareholder Return Unit (PTSRUs) [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based payment expense |  | $ 7.0 |  |
[1] | 2018 and 2017 include the impact of the TCJA on income taxes.
[2] | Includes $7.0 million of expense for PTSRUs.

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