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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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Basic and diluted:                      
Net Income from continuing operations                 $ 5,408,000,000 $ 5,163,000,000 $ 5,885,000,000
Dividends Preferred Stock $ (19,000,000) $ (21,000,000) $ (19,000,000) $ (21,000,000) $ (20,000,000) $ (22,000,000) $ (20,000,000) $ 0 (80,000,000) (62,000,000) 0
Net income available to common shareholders                 5,328,000,000 5,101,000,000 5,885,000,000
Earnings allocated to participating share awards $ (6,000,000) $ (9,000,000) $ (17,000,000) $ (11,000,000) $ (6,000,000) $ (10,000,000) $ (11,000,000) $ (11,000,000) (43,000,000) (38,000,000) (46,000,000)
Net income attributable to common shareholders                 $ 5,285,000,000 $ 5,063,000,000 $ 5,839,000,000
Denominator:                      
Basic: Weighted-average common stock                 933.0 999.0 1,045.0
Add: Weighted-average stock options                 2.0 4.0 6.0
Diluted                 935.0 1,003.0 1,051.0
Basic EPS:                      
Basic [1]                 $ 5.67 $ 5.07 $ 5.58
Diluted EPS:                      
Diluted                 $ 5.65 $ 5.05 $ 5.56
Stock Option [Member]                      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                      
Antidilutive securities excluded from computation of earnings per Share, amount                 2.4 0.5 0.2
[1]

Represents net income less (i) earnings allocated to participating share awards of $ 43 million, $ 38 million and $ 46 million for the years ended December 31, 2016 , 2015 and 2014 , respectively, and (ii) dividends on preferred shares of $ 80 million , $ 62 million and nil for the years ended December 31, 2016 , 2015 and 2014 , respectively .