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Employee Benefit Plans - Net Periodic Benefit (Income) Cost (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Sep. 17, 2012
Senior Notes due 2022 [Member]
Sep. 30, 2011
Postemployment Benefits [Member]
Jun. 30, 2011
Postemployment Benefits [Member]
Dec. 31, 2012
Postemployment Benefits [Member]
Dec. 31, 2011
Postemployment Benefits [Member]
Dec. 31, 2010
Postemployment Benefits [Member]
Dec. 31, 2012
Postretirement Benefits [Member]
Dec. 31, 2011
Postretirement Benefits [Member]
Dec. 31, 2010
Postretirement Benefits [Member]
Dec. 31, 2012
Total Pension Benefits [Member]
Dec. 31, 2011
Total Pension Benefits [Member]
Dec. 31, 2010
Total Pension Benefits [Member]
Dec. 31, 2012
U.S. Pension Benefits [Member]
Sep. 30, 2012
U.S. Pension Benefits [Member]
Dec. 31, 2012
U.S. Pension Benefits [Member]
Dec. 31, 2011
U.S. Pension Benefits [Member]
Dec. 31, 2010
U.S. Pension Benefits [Member]
Dec. 31, 2012
International Pension Benefits [Member]
Dec. 31, 2011
International Pension Benefits [Member]
Dec. 31, 2010
International Pension Benefits [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]                                        
Net service cost       $ 24 $ 25 $ 22 $ 0 $ 0 $ 0 $ 14 $ 15 $ 15     $ 0 $ 0 $ 0 $ 14 $ 15 $ 15
Interest cost       9 10 11 1 2 5 242 272 279     159 182 190 83 90 89
Expected return on plan assets                   (225) (281) (285)     (127) (175) (185) (98) (106) (100)
Prior service cost       (6) (9) (1) (18) (18) (13) 7 6 0     0 0 0 7 6 0
Actuarial loss       11 14 12 3 3 4                      
Net benefit cost       38 40 44                            
Restructuring severance cost   6   (1) 6 (1)                            
Net periodic benefit cost       37 46 43 (14) (13) (4) (224) 582 59     (261) 457 90 37 125 (31)
Debt instrument stated percentage 5.00%                                      
Company contributions                   752 125   100 500 651 9   101 116  
Pension liability                   (2) 0       0 0   (2) 0  
Reduction in long term disability benefits actuarial liability     $ 6