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Share-Based Payments - Summary of Data Related to Share-based Payment Arrangement Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost recognized, pre-tax $ 1,200 $ 780 $ 718
Total Shareholder Return Units (TSRUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted, weighted-average grant-date fair value per share (in dollars per share) [1] $ 7.26 $ 6.22 $ 8.52
Units converted, aggregate intrinsic value $ 594 $ 84 $ 175
Compensation cost recognized, pre-tax [2] 259 287 294
Total compensation cost related to nonvested awards not yet recognized, pre-tax $ 187 $ 224 $ 229
Weighted-average period over which cost is expected to be recognized (years) 1 year 7 months 6 days 1 year 7 months 6 days 1 year 7 months 6 days
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted, weighted-average grant-date fair value per share (in dollars per share) $ 34.31    
Total fair value of shares vested [1] $ 304 $ 334 $ 454
Compensation cost recognized, pre-tax [2] 281 272 275
Total compensation cost related to nonvested awards not yet recognized, pre-tax $ 271 $ 228 $ 241
Weighted-average period over which cost is expected to be recognized (years) 1 year 9 months 18 days 1 year 8 months 12 days 1 year 8 months 12 days
Portfolio Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total fair value of shares vested [1] $ 181 $ 119 $ 136
Units converted, aggregate intrinsic value 228 224 245
Compensation cost recognized, pre-tax [2] 535 180 114
Total compensation cost related to nonvested awards not yet recognized, pre-tax $ 175 $ 104 $ 87
Weighted-average period over which cost is expected to be recognized (years) 1 year 9 months 18 days 1 year 9 months 18 days 1 year 9 months 18 days
Performance Share Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total fair value of shares vested [1] $ 33 $ 25 $ 64
Compensation cost recognized, pre-tax [2] 76 31 28
Total compensation cost related to nonvested awards not yet recognized, pre-tax $ 54 $ 32 $ 34
Weighted-average period over which cost is expected to be recognized (years) 1 year 9 months 18 days 1 year 10 months 24 days 1 year 9 months 18 days
Share-based Payment Arrangement, Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total fair value of shares vested (in dollars per share) [1] $ 4.86 $ 3.56 $ 5.98
Aggregate intrinsic value on exercise $ 584 $ 293 $ 261
Cash received upon exercise 795 425 394
Tax benefits realized from exercise 106 55 47
Compensation cost recognized, pre-tax [2] 5 6 7
Total compensation cost related to nonvested awards not yet recognized, pre-tax $ 3 $ 4 $ 5
Weighted-average period over which cost is expected to be recognized (years) 1 year 7 months 6 days 1 year 8 months 12 days 1 year 7 months 6 days
[1] Weighted-average GDFV per TSRUs and stock options.
[2] TSRU includes expense for PTSRUs, which is not significant for all years presented