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Earnings Per Common Share (EPS) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Basic and diluted:                      
Income from continuing operations                 $ 5,359 $ 4,482 $ 4,899
Earnings allocated to participating share awards (11) (12) (13) (11) (7) (14) (14) (14) (47) (49) (58)
Income from discontinued operations                 0 0 36
Net income attributable to common shareholders                 5,312 4,433 4,877
Denominator:                      
Basic: Weighted-average common stock                 1,082 1,135 1,178
Add: Weighted-average stock options                 7 6 6
Diluted                 1,089 1,141 1,184
Basic EPS:                      
Income from continuing operations attributable to common shareholders $ 1.22 $ 1.26 $ 1.28 $ 1.15 $ 0.57 $ 1.10 $ 1.16 $ 1.07 $ 4.91 $ 3.91 $ 4.11
Income from discontinued operations                 $ 0 $ 0 $ 0.03
Net income attributable to common shareholders                 $ 4.91 $ 3.91 $ 4.14
Diluted EPS:                      
Income from continuing operations attributable to common shareholders $ 1.21 $ 1.25 $ 1.27 $ 1.15 $ 0.56 $ 1.09 $ 1.15 $ 1.07 $ 4.88 $ 3.89 $ 4.09
Income from discontinued operations                 $ 0 $ 0 $ 0.03
Net income attributable to common shareholders                 $ 4.88 $ 3.89 $ 4.12
Earnings Per Common Share (Textuals) [Abstract]                      
Subordinated debentures $ 750       $ 750       $ 750 $ 750 $ 750
Stock Option [Member]
                      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                      
Antidilutive securities excluded from computation of earnings per Share, amount                 0.1 7.6 19.2