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Earnings Per Common Share (EPS) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Basic and diluted:        
Net income $ 2,015.0 $ 1,473.0 $ 3,441.0 $ 2,998.0
Preferred dividends (19.0) (20.0) (40.0) (20.0)
Net income available to common stockholders - basic 1,996.0 1,453.0 3,401.0 2,978.0
Net income available to common stockholders - diluted 1,996.0 1,453.0 3,401.0 2,978.0
Earnings allocated to participating share awards (17.0) (11.0) (28.0) (22.0)
Net income attributable to common shareholders $ 1,979.0 $ 1,442.0 $ 3,373.0 $ 2,956.0
Denominator:        
Basic 938.0 1,009.0 949.0 1,013.0
Add: Weighted-average stock options 3.0 4.0 3.0 5.0
Diluted 941.0 1,013.0 952.0 1,018.0
Earnings Per Common Share, Basic (Note 15) [Abstract]        
Net income attributable to common shareholders $ 2.11 [1] $ 1.43 [1] $ 3.55 [2] $ 2.92 [2]
Earnings Per Common Share, Diluted (Note 15) [Abstract]        
Net income attributable to common shareholders $ 2.1 [3] $ 1.42 [3] $ 3.54 [4] $ 2.9 [4]
Earnings Per Common Share (Textuals) [Abstract]        
Subordinated debentures $ 750.0   $ 750.0  
Subordinated debt issuance year 2006      
Subordinated debt maturity year 2036      
Stock options [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per Share, amount 2.5 0.6 1.7 0.5
[1] Represents net income less ( i ) earnings allocated to participating share awards of $ 17 million and $ 11 million for the three months ended June 30 , 2016 and 2015 , respectively, and (ii) dividends on preferred shares of $ 19 million and $ 20 million for the three months ended June 30 , 2016 and 2015 , respectively.
[2] Represents net income less ( i ) earnings allocate d to participating share awards of $ 28 million and $ 22 million for the six months ended June 30 , 2016 and 2015 , respectively, and (ii) dividends on preferred shares of $ 40 million and $ 20 million for the six months ended June 30 , 2016 and 2015 , respectively.
[3] Represents net income less ( i ) earnings allocated to participating share awards of $ 17 million and $ 11 million for the three months ended June 30 , 2016 and 2015 , respectively, and (ii) dividends on preferred shares of $ 19 million and $ 20 million for the three months ended June 30 , 2016 and 2015 , respectively.
[4] Represents net income less ( i ) earnings allocate d to participating share awards of $ 28 million and $ 22 million for the six months ended June 30 , 2016 and 2015 , respectively, and (ii) dividends on preferred shares of $ 40 million and $ 20 million for the six months ended June 30 , 2016 and 2015 , respectively.