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Earnings Per Common Share (EPS) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Basic and diluted:        
Net income $ 1,473 $ 1,529 $ 2,998 $ 2,961
Preferred Dividends (20) 0 (20) 0
Net income available to common shareholders, basic 1,453 1,529 2,978 2,961
Net income available to common shareholders, diluted 1,453 1,529 2,978 2,961
Earnings allocated to participating share awards (11) (12) (22) (24)
Net income attributable to common shareholders $ 1,442 $ 1,517 $ 2,956 $ 2,937
Denominator:        
Basic 1,009,000,000 [1] 1,052,000,000 [1] 1,013,000,000 [2] 1,056,000,000 [2]
Add: Weighted-average stock options 4,000,000 6,000,000 5,000,000 6,000,000
Diluted 1,013,000,000 [1] 1,058,000,000 [1] 1,018,000,000 [2] 1,062,000,000 [2]
Earnings Per Common Share, Basic [Abstract]        
Income from continuing operations attributable to common shareholders $ 1.43 [1] $ 1.44 [1] $ 2.92 [2] $ 2.78 [2]
Earnings Per Common Share, Diluted [Abstract]        
Income from continuing operations attributable to common shareholders $ 1.42 [1] $ 1.43 [1] $ 2.9 [2] $ 2.77 [2]
Stock options [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per Share, amount 600,000 200,000 500,000 200,000
[1] Represents net income less ( i ) earnings allocated to participating share awards of $ 11 million and $ 12 million for the three months ended June 30, 2015 and 2014 , respect ively, and (ii) dividends on preferred shares of $20 million and nil for the three months ended June 30, 2015
[2] Represents net income less ( i ) earnings allocate d to participating share awards of $ 22 million and $ 24 million for the six months ended June 30 , 2015 and 2014 , respectively, and (ii) di vidends on preferred shares of $20 million and nil for the six months ended June 30, 2015 and 2014, respectively.