Fair Value Measurements (Details 2) In Millions, unless otherwise specified	Mar. 31, 2014 Eurobond Due 2014 EUR (€)	Mar. 31, 2014 Carrying Amount USD ($)	Dec. 31, 2013 Carrying Amount USD ($)	Mar. 31, 2014 Carrying Amount Eurobond Due 2014 USD ($)	Dec. 31, 2013 Carrying Amount Eurobond Due 2014 USD ($)	Mar. 31, 2014 Fair Value USD ($)	Dec. 31, 2013 Fair Value USD ($)	Mar. 31, 2014 Fair Value Eurobond Due 2014 USD ($)	Dec. 31, 2013 Fair Value Eurobond Due 2014 USD ($)
Financial Instruments
Eurobond securities due July 2014				$ 1,413	$ 1,424			$ 1,425	$ 1,447
Long-term debt, excluding current portion		4,401	4,326			4,633	4,463
Principal amount	€ 1,025