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Total Equity and Other Comprehensive Income (Rollforward of Total Equity) (Details) (USD $)
In Millions, except Share data
3 Months Ended9 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Common Stock [Member]
Dec. 31, 2010
Common Stock [Member]
Sep. 30, 2011
Preferred Stock Including Additional Paid in Capital [Member]
Sep. 30, 2011
Preferred Stock Including Additional Paid in Capital [Member]
Preferred Stock Series O [Member]
Sep. 30, 2011
Common Stock Including Additional Paid in Capital [Member]
Sep. 30, 2011
Retained Earnings [Member]
Sep. 30, 2011
Accumulated Other Comprehensive Income (Loss) [Member]
Sep. 30, 2011
Treasury Stock [Member]
Sep. 30, 2011
Noncontrolling Interest [Member]
Sep. 30, 2011
Preferred Stock Series O [Member]
Beginning Balance  $ 32,838 $ 2,682$ 2,682$ 647 $ 12,057$ 15,859$ (431)$ (572)$ 2,596 
Beginning Balance (in shares)    526,000,000526,000,000        
Net income8341,1032,5782,577     2,580  (2) 
Net unrealized gains on other-than- temporary impairment debt securities  29       29   
Net unrealized securities gains  569       569   
Net unrealized losses on cash flow hedge derivatives  209       209   
Pension, other postretirement and postemployment benefit plan adjustments  10       10   
Other  11       11   
Comprehensive income (loss)  3,4064,700        (2) 
Cash dividends declared - Common  (421)      (421)    
Cash dividends declared - Preferred  (32)      (32)    
Preferred Stock, Accretion of Redemption Discount      1  (1)    
Common stock activity  6[1]     6[1]     
Treasury stock activity  14[1]     (23)[1]  37[1]  
Preferred Stock Shares Issued Total Value       988[2]     988[2]
Other  443     14   429 
Ending Balance$ 37,242 $ 37,242 $ 2,682$ 2,682$ 1,636 $ 12,054$ 17,985$ 397$ (535)$ 3,023 
Ending Balance, (in shares)    526,000,000526,000,000        
Common and net treasury stock activity, shares  500,000           
Preferred Stock Par Or Stated Value Per Share             $ 1
Shares issued during period, Preferred Stock             10,000
[1]Common and net treasury stock activity totaled less than .5 million shares.
[2]10,000 Series O preferred shares with a $1 par value were issued on July 20, 2011.