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Quarterly Financial Data (Unaudited) (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
$ / shares
Sep. 30, 2016
USD ($)
$ / shares
Jun. 30, 2016
USD ($)
$ / shares
Mar. 31, 2016
USD ($)
$ / shares
Dec. 31, 2015
USD ($)
$ / shares
Sep. 30, 2015
USD ($)
$ / shares
Jun. 30, 2015
USD ($)
$ / shares
Mar. 31, 2015
USD ($)
$ / shares
Dec. 31, 2016
USD ($)
$ / shares
Dec. 31, 2015
USD ($)
$ / shares
Dec. 31, 2014
USD ($)
$ / shares
Disclosure of quarterly financial data                      
Total revenues net of interest expense | $ $ 8,022,000,000 $ 7,774,000,000 $ 8,235,000,000 $ 8,088,000,000 $ 8,391,000,000 $ 8,193,000,000 $ 8,284,000,000 $ 7,950,000,000 $ 32,119,000,000 $ 32,818,000,000 $ 34,188,000,000
Pretax income | $ 1,161,000,000 1,735,000,000 3,016,000,000 2,184,000,000 1,454,000,000 1,938,000,000 2,230,000,000 2,316,000,000 8,096,000,000 7,938,000,000 8,991,000,000
Net income | $ $ 825,000,000 $ 1,142,000,000 $ 2,015,000,000 $ 1,426,000,000 $ 899,000,000 $ 1,266,000,000 $ 1,473,000,000 $ 1,525,000,000 $ 5,408,000,000 $ 5,163,000,000 $ 5,885,000,000
Earnings per Common Share                      
Basic | $ / shares [1]                 $ 5.67 $ 5.07 $ 5.58
Net income attributable to common shareholders | $ / shares $ 0.88 $ 1.21 $ 2.11 $ 1.45 $ 0.89 $ 1.24 $ 1.43 $ 1.49      
Earnings per Common Share                      
Diluted | $ / shares                 5.65 5.05 5.56
Net income attributable to common shareholders | $ / shares 0.88 1.2 2.1 1.45 0.89 1.24 1.42 1.48      
Cash dividends declared per common share | $ / shares $ 0.32 $ 0.32 $ 0.29 $ 0.29 $ 0.29 $ 0.29 $ 0.29 $ 0.26 $ 1.22 $ 1.13 $ 1.01
Common share price:                      
High | $ 75.74 66.71 67.34 68.18 77.85 81.66 81.92 93.94      
Low | $ 59.5 58.25 57.15 50.27 67.57 71.71 76.53 77.12      
[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 .