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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Basic Earnings per Common Share                      
Net income attributable to stockholders $ 1,835 $ 2,773 $ 2,866 $ 1,953 $ 6,266 $ 1,359 $ 1,117 $ 945 $ 9,427 $ 9,687 $ 3,949
Less: cumulative dividends on preferred stock and charge related to redemption and purchase of preferred stock                     (1,145)
Net income attributable to common stockholders - basic                 $ 9,427 $ 9,687 $ 2,804
Weighted-average common shares outstanding - basic                 1,540 1,586 1,605
Basic earnings per common share $ 1.21 $ 1.79 $ 1.85 $ 1.26 $ 4.03 $ 0.86 $ 0.70 $ 0.58 $ 6.12 $ 6.11 $ 1.75
Diluted Earnings Per Share [Abstract]                      
Net income attibutable to common stockholders - diluted                 $ 9,427 $ 9,686 $ 2,786
Weighted-average common shares outstanding - basic                 1,540 1,586 1,605
Dilutive effect of warrants and awards under stock incentive plans                 30 54 82
Weighted-average common shares outstanding - diluted                 1,570 1,640 1,687
Diluted earnings per common share $ 1.19 $ 1.76 $ 1.81 $ 1.24 $ 3.92 $ 0.84 $ 0.67 $ 0.56 $ 6.00 $ 5.91 $ 1.65
Potentially dilutive securities                 0 72 46