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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Basic        
Income from continuing operations $ 2,390 $ 2,430 $ 3,506 $ 5,107
Less: cumulative dividends on subsidiary preferred stock (15) 0 (29) 0
Income from continuing operations attributable to common stockholders 2,375 2,430 3,477 5,107
Loss from discontinued operations, net of tax 0 770 70 839
Net income attributable to common stockholders $ 2,375 $ 1,660 $ 3,407 $ 4,268
Weighted-average common shares outstanding - basic (in shares) 1,410 1,497 1,409 1,501
Basic earnings per common share – continuing operations (in dollars per share) $ 1.68 $ 1.62 $ 2.47 $ 3.40
Basic loss per common share – discontinued operations (in dollars per share) 0.00 0.51 0.05 0.56
Basic earnings per common share (in dollars per share) $ 1.68 $ 1.11 $ 2.42 $ 2.84
Diluted        
Income from continuing operations attributable to common stockholders – diluted $ 2,375 $ 2,430 $ 3,477 $ 5,107
Loss from discontinued operations, net of tax – diluted 0 770 70 839
Net income attributable to common stockholders – diluted $ 2,375 $ 1,660 $ 3,407 $ 4,268
Weighted-average common shares outstanding - basic (in shares) 1,410 1,497 1,409 1,501
Dilutive effect of warrants and awards under stock incentive plans 21 22 21 24
Weighted-average common shares outstanding - diluted (in shares) 1,431 1,519 1,430 1,525
Diluted earnings per common share – continuing operations (in dollars per share) $ 1.66 $ 1.60 $ 2.43 $ 3.35
Diluted loss per common share – discontinued operations (in dollars per share) 0.00 0.51 0.05 0.55
Diluted earnings per common share (in dollars per share) $ 1.66 $ 1.09 $ 2.38 $ 2.80
Potentially dilutive securities (in shares) 4 6 4 6