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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Basic    
Income from continuing operations $ 2,157 $ 1,116
Less: cumulative dividends on subsidiary preferred stock (38) (14)
Income from continuing operations attributable to common stockholders 2,119 1,102
Loss from discontinued operations, net of tax 0 70
Net income attributable to common stockholders $ 2,119 $ 1,032
Weighted-average common shares outstanding - basic (in shares) 1,417 1,408
Basic earnings per common share – continuing operations (in dollars per share) $ 1.50 $ 0.78
Basic loss per common share – discontinued operations (in dollars per share) 0.00 0.05
Basic earnings per common share (in dollars per share) $ 1.50 $ 0.73
Diluted    
Income from continuing operations attributable to common stockholders – diluted $ 2,119 $ 1,102
Loss from discontinued operations, net of tax – diluted 0 70
Net income attributable to common stockholders – diluted $ 2,119 $ 1,032
Weighted-average common shares outstanding - basic (in shares) 1,417 1,408
Dilutive effect of warrants and awards under stock incentive plans (in shares) 19 22
Weighted-average common shares outstanding - diluted (in shares) 1,436 1,430
Diluted earnings per common share – continuing operations (in dollars per share) $ 1.48 $ 0.77
Diluted loss per common share – discontinued operations (in dollars per share) 0.00 0.05
Diluted earnings per common share (in dollars per share) $ 1.48 $ 0.72
Potentially dilutive securities (in shares) 8 4