Registration of securities issued in business combination transactions

EMPLOYEE BENEFIT PLANS (Details)

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EMPLOYEE BENEFIT PLANS (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Sep. 30, 2012
Defined Benefit Plans
Sep. 30, 2011
Defined Benefit Plans
Sep. 30, 2012
Defined Benefit Plans
Sep. 30, 2011
Defined Benefit Plans
Sep. 30, 2012
Other Postretirement Benefit Plans
Sep. 30, 2011
Other Postretirement Benefit Plans
Sep. 30, 2012
Other Postretirement Benefit Plans
Sep. 30, 2011
Other Postretirement Benefit Plans
Components of net periodic benefit cost                            
Service cost             $ 12 $ 18 $ 43 $ 51 $ 1   $ 3 $ 2
Interest cost             36 39 109 116 2 2 5 6
Expected return on assets             (45) (47) (136) (141)        
Amortization of prior service cost             (2) (2) (6) (5) (1) (1) (2) (2)
Amortization of actuarial loss             13 9 37 26   1 1 1
Settlement loss             8   8          
Net periodic benefit cost             22 17 55 47 2 2 7 7
Reduction of pension liability   23                        
Contributions to pension and other postretirement benefit plans   124 132 14 14 12                
Expected contributions to pension and other postretirement benefit plans during remainder of 2012 31 31                        
Noncash charge related to pension settlement loss $ 8