Derivative and Hedging Activities Narrative (Details)						3 Months Ended	6 Months Ended
	Jun. 30, 2013 USD ($)	Dec. 31, 2012 USD ($)	Jun. 30, 2013 Senior Notes USD ($)	Jun. 30, 2013 Senior Notes 6.25% Euro-Denominated Senior Notes Due 2017 USD ($)	Dec. 31, 2012 Senior Notes 6.25% Euro-Denominated Senior Notes Due 2017 USD ($)	Jun. 30, 2011 Senior Notes 6.25% Euro-Denominated Senior Notes Due 2017 Cross Currency Interest Rate Contract [Member] USD ($)	Jun. 30, 2013 Senior Notes 6.25% Euro-Denominated Senior Notes Due 2017 Cross Currency Interest Rate Contract [Member] USD ($)	Feb. 08, 2013 Senior Notes 6.25% Euro-Denominated Senior Notes Due 2017 Cross Currency Interest Rate Contract [Member]	May 31, 2011 Senior Notes 6.25% Euro-Denominated Senior Notes Due 2017 Cross Currency Interest Rate Contract [Member] USD ($)	Dec. 31, 2006 Senior Notes 6.25% Euro-Denominated Senior Notes Due 2017 Cross Currency Interest Rate Contract [Member] EUR (€)	Jun. 30, 2013 Senior Notes 6.25% Euro-Denominated Senior Notes Due 2017 Cross Currency Interest Rate Contract [Member] Maturity Payment [Member] USD ($)	Jun. 30, 2013 Multi-Counterparty Hedging Facility USD ($) Mcfe counterparty	Jun. 30, 2013 Multi-Counterparty Hedging Facility Credit Risk counterparty	Jun. 30, 2013 Multi-Counterparty Hedging Facility Semi-Annual Collateral Dates	Jun. 30, 2013 Multi-Counterparty Hedging Facility Between Semi-Annual Collateral Dates	Jun. 30, 2013 Price Risk Derivative [Member] Multi-Counterparty Hedging Facility Mcfe	Jun. 30, 2013 Basis Derivative [Member] Multi-Counterparty Hedging Facility Mcfe
Derivative [Line Items]
Number of counterparties in hedge facility												16	15
Multi-counterparty hedging facility, committed to provide a trading capacity (in tcfe)												6,200,000,000
Multi-counterparty hedge facility, committed to provide an aggregate mark-to-market capacity												$ 16,500,000,000
Multi-counterparty hedge facility, hedged total (in tcfe)																1,400,000,000	100,000,000
Natural gas and oil proved reserves, the value of which must cover the fair value of the transactions outstanding under the facility, multiplier														1.65	1.30
Duration gains will be recognized on terminated qualifying interest rate derivative transactions, years	8 years
Deferred (Gain) Loss on Discontinuation of Fair Value Hedge	16,000,000
Debt Instrument, Face Amount			2,300,000,000							600,000,000
Debt Instrument Interest Rate Stated Percentage							6.25%	6.25%
Debt Instrument, Increase (Decrease), Net						256,000,000
Semi Annual Interest Rate Swap Payments By Counterparty							11,000,000				344,000,000
Semi Annual Interest Rate Swap Payments By Chesapeake							17,000,000				459,000,000
Dollar Equivalent Interest Rate							7.491%
Derivative, Forward Exchange Rate							1.3010		1.3325
Liability commodity contracts							27,000,000
Euro-denominated debt in notes payable, adjusted value	13,057,000,000	12,620,000,000		447,000,000	454,000,000		447,000,000
Derivative Instruments, Gain (Loss) Reclassification from AOCI to Income, Estimated Net Amount to be Transferred	168,000,000
Cash Flow Hedges, Accumulated OCI Balance	178,000,000
Expected amount to be transferred of during the next 12 months	$ 21,000,000
Derivative, Number of Instruments Held	0