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Share-Based Payments - Narrative (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for award 411,000,000    
Compensation cost recognized, pre-tax $ 780 $ 718 $ 949
Tax benefit for share-based compensation expense 141 137 180
Discontinued Operations [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost recognized, pre-tax $ 23 30 27
2019 Stock Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of additional shares authorized 400,000,000    
Maximum shares available per individual during the plan period 20,000,000    
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost recognized, pre-tax [1] $ 272 275 286
Restricted Stock Units (RSUs) [Member] | 2019 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]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost recognized, pre-tax [1] $ 180 114 276
Portfolio Performance Shares [Member] | 2019 Stock Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares counted toward maximum 3    
Performance Share Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost recognized, pre-tax [1] $ 31 28 62
Performance Share Awards [Member] | 2019 Stock Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares counted toward maximum 3    
Total Shareholder Return Units (TSRUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost recognized, pre-tax [1] $ 287 294 302
Total Shareholder Return Units (TSRUs) [Member] | 2019 Stock Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares counted toward maximum 1    
Share-based Payment Arrangement, Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost recognized, pre-tax [1] $ 6 $ 7 $ 12
Share-based Payment Arrangement, Option [Member] | 2019 Stock Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares counted toward maximum 1    
[1] TSRU includes expense for PTSRUs, which is not significant for all years presented