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Retirement Benefits Plans - Changes in Pension and Other Postretirement Liabilities Recognized in AOCI (Details 4) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Changes in pension and other postretirement benefit liabilities recognized in Accumulated other comprehensive loss      
Prior service cost arising during the year $ (1) $ (82) $ 6
Less amounts included in expense during the year 123 718 (456)
Net change for the year 0 0 (2)
United States pension liabilities [Member]      
Changes in pension and other postretirement benefit liabilities recognized in Accumulated other comprehensive loss      
Balance at January 1 1,382 1,054  
Prior service cost arising during the year 0 2  
Net loss (gain) arising during the year 138 490  
Currency translation 0 0  
Less amounts included in expense during the year (193) (164)  
Net change for the year (55) 328  
Balance at December 31 1,327 1,382 1,054
Non-United States pension liabilities [Member]      
Changes in pension and other postretirement benefit liabilities recognized in Accumulated other comprehensive loss      
Balance at January 1 706 528  
Prior service cost arising during the year 0 0  
Net loss (gain) arising during the year 47 262  
Currency translation (58) (55)  
Less amounts included in expense during the year (42) (29)  
Net change for the year (53) 178  
Balance at December 31 653 706 528
Other postretirement liabilities [Member]      
Changes in pension and other postretirement benefit liabilities recognized in Accumulated other comprehensive loss      
Balance at January 1 90 184  
Prior service cost arising during the year (1) (84)  
Net loss (gain) arising during the year (62) (34)  
Currency translation (4) (1)  
Less amounts included in expense during the year (2) 25  
Net change for the year (69) (94)  
Balance at December 31 $ 21 $ 90 $ 184