Derivative and Hedging Activities Narrative (Details)						3 Months Ended	9 Months Ended
	Sep. 30, 2013 USD ($)	Dec. 31, 2012 USD ($)	Sep. 30, 2013 Senior Notes USD ($)	Sep. 30, 2013 Senior Notes 6.25% Euro-Denominated Senior Notes Due 2017 USD ($)	Dec. 31, 2012 Senior Notes 6.25% Euro-Denominated Senior Notes Due 2017 USD ($)	Jun. 30, 2011 Senior Notes 6.25% Euro-Denominated Senior Notes Due 2017 Cross Currency Interest Rate Contract [Member] EUR (€)	Sep. 30, 2013 Senior Notes 6.25% Euro-Denominated Senior Notes Due 2017 Cross Currency Interest Rate Contract [Member] USD ($)	Dec. 31, 2006 Senior Notes 6.25% Euro-Denominated Senior Notes Due 2017 Cross Currency Interest Rate Contract [Member] USD ($)	Dec. 31, 2006 Senior Notes 6.25% Euro-Denominated Senior Notes Due 2017 Cross Currency Interest Rate Contract [Member] EUR (€)	Sep. 30, 2013 Senior Notes 6.25% Euro-Denominated Senior Notes Due 2017 Cross Currency Interest Rate Contract [Member] Maturity Payment [Member] USD ($)	Sep. 30, 2013 Senior Notes 6.25% Euro-Denominated Senior Notes Due 2017 Cross Currency Interest Rate Contract [Member] Maturity Payment [Member] EUR (€)	Sep. 30, 2013 Multi-Counterparty Hedging Facility USD ($) counterparty	Sep. 30, 2013 Multi-Counterparty Hedging Facility Credit Risk counterparty	Sep. 30, 2013 Multi-Counterparty Hedging Facility Energy Related Derivative [Member] Mcfe	Sep. 30, 2013 Multi-Counterparty Hedging Facility Price Risk Derivative [Member] Mcfe	Sep. 30, 2013 Multi-Counterparty Hedging Facility Semi-Annual Collateral Dates	Sep. 30, 2013 Multi-Counterparty Hedging Facility Between Semi-Annual Collateral Dates	Sep. 30, 2013 Price Risk Derivative [Member] Multi-Counterparty Hedging Facility Mcfe	Sep. 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)														6,400,000,000	6,400,000,000
Multi-counterparty hedge facility, committed to provide an aggregate mark-to-market capacity												$ 17,000,000,000
Multi-counterparty hedge facility, hedged total (in tcfe)																		1,200,000,000	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	7 years
Deferred (Gain) Loss on Discontinuation of Fair Value Hedge	14,000,000
Debt Instrument, Face Amount			2,300,000,000						600,000,000
Debt Instrument, Interest Rate, Stated Percentage							6.25%	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							1.3527	1.3325
Liability commodity contracts							5,000,000
Euro-denominated debt in notes payable, adjusted value	12,736,000,000	12,620,000,000		465,000,000	454,000,000		465,000,000
Derivative Instruments, Gain (Loss) Reclassification from AOCI to Income, Estimated Net Amount to be Transferred	166,000,000
Cash Flow Hedges, Accumulated OCI Balance	174,000,000
Expected amount to be transferred of during the next 12 months	$ 22,000,000
Derivative, Number of Instruments Held	0