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Summary of Significant Accounting Policies - Earnings per common share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Numerator: |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | $ 3,189 | $ 1,877 | $ 2,171
Less: Preferred stock dividends |  |  |  |  |  |  |  |  | 116 | 116 | 116
Net income applicable to common shareholders | $ 1,220 | $ 637 | $ 550 | $ 666 | $ 811 | $ 491 | $ 242 | $ 217 | $ 3,073 | $ 1,761 | $ 2,055
Denominator: |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding (in shares) |  |  |  |  |  |  |  |  | 362.0 | 372.8 | 401.1
Effect of dilutive potential common shares: |  |  |  |  |  |  |  |  |  |  |
Stock options (in shares) |  |  |  |  |  |  |  |  | 4.3 | 3.2 | 4.0
Restricted stock units(non-participating) and performance stock awards (in shares) |  |  |  |  |  |  |  |  | 1.5 | 1.3 | 1.7
Weighted average common and dilutive potential common shares outstanding (in shares) |  |  |  |  |  |  |  |  | 367.8 | 377.3 | 406.8
Earnings per common share - Basic (in dollars per share) | $ 3.41 | $ 1.76 | $ 1.51 | $ 1.82 | $ 2.20 | $ 1.32 | $ 0.65 | $ 0.57 | $ 8.49 | $ 4.72 | $ 5.12
Earnings per common share - Diluted (in dollars per share) | $ 3.35 | $ 1.74 | $ 1.49 | $ 1.79 | $ 2.18 | $ 1.31 | $ 0.64 | $ 0.57 | $ 8.36 | $ 4.67 | $ 5.05
Other Earnings Per Share Disclosures |  |  |  |  |  |  |  |  |  |  |
Antidilutive stock options, exercise price exceeds market price (in shares) |  |  |  |  |  |  |  |  | 1.5 | 3.8 | 2.2
Antidilutive stock options, exercise price exceeds market price, exercise price range, low end of range (in dollars per share) |  |  |  |  |  |  |  |  | $ 70.71 | $ 53.91 | $ 57.98
Antidilutive stock options, exercise price exceeds market price, exercise price range, high end of range (in dollars per share) |  |  |  |  |  |  |  |  | $ 102.84 | $ 71.29 | $ 71.29

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