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Comprehensive Income
9 Months Ended
Sep. 30, 2011
Disclosure Text Block [Abstract] 
Comprehensive Income

11. Comprehensive Income

Comprehensive income includes net income and changes in AOCI, which is a balance sheet item in the Shareholders' Equity section of the Company's Consolidated Balance Sheets. AOCI is comprised of items that have not been recognized in earnings but may be recognized in earnings in the future when certain events occur.

The components of comprehensive income, net of tax, were as follows:

     Three Months Ended  Nine Months Ended
     September 30,  September 30,
(Millions)  2011  2010  2011  2010
Net income $1,235 $1,093 $3,743 $2,995
Other comprehensive income gains (losses):            
 Net unrealized securities gains  113  104  205  113
 Net unrealized derivative (losses) gains  (1)  4  6  16
 Foreign currency translation adjustments  (178)  307  (116)  242
 Net unrealized pension and other postretirement benefit            
   gains  14  4  19  39
Total $1,183 $1,512 $3,857 $3,405