Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Narrative) (Details)	3 Months Ended	12 Months Ended
	Jun. 30, 2014 USD ($)	Dec. 31, 2014 Minimum [Member]	Dec. 31, 2014 Minimum [Member] Equipment and Buildings [Member]	Dec. 31, 2014 Minimum [Member] Computer Software, Intangible Asset [Member]	Dec. 31, 2014 Maximum [Member]	Dec. 31, 2014 Maximum [Member] Equipment and Buildings [Member]	Dec. 31, 2014 Maximum [Member] Computer Software, Intangible Asset [Member]	Dec. 31, 2014 Fair Value, Inputs, Level 1 [Member] USD ($)	Dec. 31, 2013 Fair Value, Inputs, Level 1 [Member] USD ($)	Dec. 31, 2014 Level 2 Inputs [Member] USD ($)	Dec. 31, 2013 Level 2 Inputs [Member] USD ($)	Dec. 31, 2014 Foreign exchange rate - Bolivar [Member] VEF	Jun. 30, 2014 Foreign exchange rate - SICAD 2 [Member] VEF
Summary of Significant Accounting Policies [Line Items]
Official currency exchange rate in Venezuela												6.3
SICAD 2 Venezuelan foreign currency exchange rate													49.98
Fair value of cash equivalents								1,436,000,000	5,116,000,000	3,293,000,000	2,256,000,000
Held-to-maturity, marketable securities, maturity timing in months		3 months			12 months
Property, Plant and Equipment, Useful Life			15 years	5 years		25 years	7 years
Definite-lived intangible assets, useful life		1 year			20 years
Asset retirement obligations, useful life		1 year			25 years
SICAD 2 pre-tax charge	$ 58,000,000