Pension and Post-Retirement Benefits - Rate Assumptions Associated with the Pension and Post-Retirement Medical Benefit Plans to Determine Periodic Pension Costs (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
United States
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.60%	4.35%	5.05%
Expected rate of return on plan assets	7.75%	8.25%	8.25%
Compensation rate increase		3.55%	3.55%
International
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.96%	3.52%	3.69%
Expected rate of return on plan assets	4.87%	4.98%	4.85%
Compensation rate increase	2.59%	2.95%	3.05%
Post-Retirement Medical Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.90%	4.50%	5.25%