Financial Instruments and Risk Management (Credit Risk) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Concentration Risk [Line Items]
Number of debt instruments with related interest rate swaps	3
Longterm Debt Percentage Bearing Fixed Interest Amount After Swaps	$ 6,300,000,000
Maximum term of currency derivative instruments (in years)	1 year
Long-term Debt, Percentage Bearing Fixed Interest, Amount	$ 7,800,000,000	$ 4,820,000,000
Geographic Concentration Risk | Accounts Receivable | United States
Concentration Risk [Line Items]
Concentration Risk, Percentage (in hundredths)		36.00%
United States | Accounts Receivable
Concentration Risk [Line Items]
Concentration Risk, Percentage (in hundredths)	34.00%
VENEZUELA | Accounts Receivable
Concentration Risk [Line Items]
Concentration Risk, Percentage (in hundredths)	8.00%	9.00%