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Retirement Benefits Plans Retirement Benefits Plans - Employer Contributions to Retirement Benefits Plans (Details 9) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
United States pension plans [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans      
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year $ 59    
Employer contributions to pension plans 221 $ 248 $ 196
Non-United States pension plans [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans      
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year 103    
Employer contributions to pension plans 109 114 145
Total contributions [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans      
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year 162    
Employer contributions to pension plans $ 330 $ 362 $ 341