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Comprehensive Income
6 Months Ended
Jun. 30, 2011
Comprehensive Income Note [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  Six Months Ended
     June 30,  June 30,
(Millions)  2011  2010  2011  2010
Net income $1,331 $1,017 $2,508 $1,902
Other comprehensive income gains (losses):            
 Net unrealized securities gains  91  25  92  9
 Net unrealized derivative gains  3  5  7  12
 Foreign currency translation adjustments  (4)  (34)  62  (65)
 Net unrealized pension and other postretirement benefit            
   gains  8  8  5  35
Total $1,429 $1,021 $2,674 $1,893