v2.4.0.8
Retirement Benefits Plans - Change in Plan Assets (Details 2) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Change in plan assets        
Balance at December 31   $ 4,372 $ 3,855  
United States pension liabilities [Member]
        
Change in plan assets        
Balance at January 1 2,940 2,607 1,664  
Actual return on plan assets   383 293  
Employer contributions 254 196 311 264
Gross benefits paid   (246) (132)  
Foreign currency translation   0 0  
Acquisition   0 471  
Other   0 0  
Balance at December 31   2,940 2,607 1,664
Non-United States pension liabilities [Member]
        
Change in plan assets        
Balance at January 1 1,432 1,248 989  
Actual return on plan assets   118 86  
Employer contributions 108 145 102 108
Gross benefits paid   (90) (78)  
Foreign currency translation   15 39  
Acquisition   0 128  
Other   (4) (18)  
Balance at December 31   1,432 1,248 989
Other postretirement liabilities [Member]
        
Change in plan assets        
Balance at January 1   146 156  
Actual return on plan assets   15 13  
Employer contributions   59 43  
Gross benefits paid   (103) (94)  
Foreign currency translation   0 0  
Acquisition   0 0  
Other   21 28  
Balance at December 31   $ 138 $ 146