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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Basic Earnings per Common Share      
Income from continuing operations $ 10,019 $ 6,427 $ 6,732
Less: cumulative dividends on subsidiary preferred stock (182) (180) (151)
Net income attributable to common stockholders $ 9,837 $ 6,247 $ 6,581
Weighted-average common shares outstanding - basic (in shares) 1,451 1,433 1,424
Basic earnings per common share (in dollars per share) $ 6.78 $ 4.36 $ 4.62
Diluted earnings per share      
Net income attributable to common stockholders – diluted $ 9,837 $ 6,247 $ 6,581
Weighted-average common shares outstanding - basic (in shares) 1,451 1,433 1,424
Dilutive effect of warrants and awards under stock incentive plans (in shares) 17 9 15
Weighted-average common shares outstanding – diluted (in shares) 1,468 1,442 1,439
Diluted earnings per common share (in dollars per share) $ 6.70 $ 4.33 $ 4.57
Potentially dilutive securities (in shares) 2 7 7