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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
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.