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Earnings Per Share (Summary of Earnings Per Share) (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Earnings Per Share [Abstract]        
Income from continuing operations, net of tax $ 6,217 $ 588 $ 7,389 $ 418
Less: Net income attributable to noncontrolling interest 344 290 671 596
Net income allocated to participating securities 3 0 3 0
Income (loss) from continuing operations available to common stockholders 5,870 298 6,715 (178)
Income from discontinued operations, net of tax 0 8,214 0 8,448
Income available to common stockholders $ 5,870 $ 8,512 $ 6,715 $ 8,270
Weighted average common shares outstanding:        
Basic (in shares) 532 650 549 651
Effect of dilutive securities (in shares) 4 4 4 0
Diluted (in shares) 536 654 553 651
Basic:        
Continuing operations $ 11.03 $ 0.46 $ 12.24 $ (0.27)
Discontinued operations 0 12.63 0 12.98
Net income per share 11.03 13.09 12.24 12.71
Diluted:        
Continuing operations 10.95 0.45 12.15 (0.27)
Discontinued operations 0 12.55 0 12.98
Net income per share $ 10.95 $ 13.00 $ 12.15 $ 12.71