Summary of Accounting Policies - Pensions (Details 4) - U.S. and European Qualified Plans	12 Months Ended
	Dec. 31, 2015 item
Minimum
Pensions
Inactive population for plan population to be considered "all or almost all" inactive (as a percent)	90.00%
Long-term corporate bonds | Minimum
Pensions
Number of highest ratings	1
Long-term corporate bonds | Maximum
Pensions
Number of highest ratings	2