Quarterly report pursuant to Section 13 or 15(d)

Earnings Per Common Share - Diluted (Details)

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Earnings Per Common Share - Diluted (Details) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Diluted earnings (loss) per common share    
Net income (loss) applicable to common shareholders $ 1,110 $ 328
Dividends and undistributed earnings allocated to participating securities 0 (1)
Net income (loss) allocated to common shareholders $ 1,110 $ 327
Average common shares issued and outstanding 10,798,975 10,651,367
Dilutive potential common shares 355,803 [1] 110,550 [1]
Total diluted average common shares issued and outstanding (in thousands) 11,154,778 10,761,917
Diluted earnings (loss) per common share $ 0.10 $ 0.03
[1] Includes incremental shares from restricted stock units, restricted stock, stock options and warrants