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Earnings Per Common Share (EPS) (Details) - USD ($)
$ / shares in Units, shares in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Basic and diluted:                      
Net Income from continuing operations                 $ 5,163,000,000 $ 5,885,000,000 $ 5,359,000,000
Dividends Preferred Stock $ (20,000,000) $ (22,000,000) $ (20,000,000) $ 0         (62,000,000) 0 0
Net income available to common shareholders                 5,101,000,000 5,885,000,000 5,359,000,000
Earnings allocated to participating share awards $ (6,000,000) $ (10,000,000) $ (11,000,000) $ (11,000,000) $ (11,000,000) $ (11,000,000) $ (12,000,000) $ (12,000,000) (38,000,000) (46,000,000) (47,000,000)
Net income attributable to common shareholders                 $ 5,063,000,000 $ 5,839,000,000 $ 5,312,000,000
Denominator:                      
Basic: Weighted-average common stock                 999.0 1,045.0 1,082.0
Add: Weighted-average stock options                 4.0 6.0 7.0
Diluted                 1,003.0 1,051.0 1,089.0
Basic EPS:                      
Basic [1]                 $ 5.07 $ 5.58 $ 4.91
Net income attributable to common shareholders $ 0.89 $ 1.24 $ 1.43 $ 1.49 $ 1.4 $ 1.41 $ 1.44 $ 1.34      
Diluted EPS:                      
Diluted                 $ 5.05 $ 5.56 $ 4.88
Net income attributable to common shareholders $ 0.89 $ 1.24 $ 1.42 $ 1.48 $ 1.39 $ 1.4 $ 1.43 $ 1.33      
Earnings Per Common Share (Textuals) [Abstract]                      
Subordinated debentures $ 750,000,000       $ 750,000,000       $ 750,000,000 $ 750,000,000 $ 750,000,000
Stock Option [Member]                      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                      
Antidilutive securities excluded from computation of earnings per Share, amount                 0.5 0.2 0.1
[1] Represents net income less ( i ) earnings allocated to participating share awards of $ 38 million, $ 46 million and $ 47 million for the years ended December 31, 2015 , 2014 and 2013 , respectively , and (ii) dividends on preferred shares of $ 62 million for the year ended December 31, 2015 , and nil f or the years ended December 31, 2014 and 2013 .