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Parent Company (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Non-interest revenues                      
Gain on sale of securities                 $ 16 $ (5) $ 225
Other revenue                 2,164 1,927 2,090
Total non-interest revenues                 25,321 22,713 21,212
Interest income                 6,961 7,292 5,331
Interest expense                 (2,320) (2,423) (2,207)
Expenses                      
Salaries and employee benefits                 6,252 5,566 5,080
Other                 2,761 2,301 2,131
Total                 21,894 19,411 16,182
Pretax loss 1,748 1,711 1,765 1,732 1,477 1,640 1,595 1,252 6,956 5,964 2,841
Income tax provision                 2,057 1,907 704
Income from continuing operations 1,192 1,235 1,295 1,177 1,062 1,093 1,017 885 4,899 4,057 2,137
Income (loss) from discontinued operations, net of tax 0 0 (36) 0 0 0 0 0 (36) 0 7
Net income 1,192 1,235 1,331 1,177 1,062 1,093 1,017 885 4,935 4,057 2,130
Parent Company [Member]
                      
Non-interest revenues                      
Gain on sale of securities                 15 0 211
Other revenue                 3 8 4
Total non-interest revenues                 18 8 215
Interest income                 142 136 142
Interest expense                 633 638 562
Total revenues net of interest expense                 (473) (494) (205)
Expenses                      
Salaries and employee benefits                 173 153 111
Other                 186 117 161
Total                 359 270 272
Pretax loss                 (832) (764) (477)
Income tax provision                 (346) (292) (164)
Net loss before equity in net income of subsidiaries and affiliates                 (486) (472) (313)
Equity in net income of subsidiaries and affiliates                 5,385 4,529 2,450
Income from continuing operations                 4,899 4,057 2,137
Income (loss) from discontinued operations, net of tax                 (36) 0 7
Net income                 $ 4,935 $ 4,057 $ 2,130