Derivative and Hedging Activities - Narrative (Details)														3 Months Ended
	Mar. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Mar. 31, 2014 Multi-Counterparty Hedging Facility USD ($) counterparty	Mar. 31, 2014 Multi-Counterparty Hedging Facility Credit Risk counterparty	Mar. 31, 2014 Multi-Counterparty Hedging Facility Energy Related Derivative [Member] MMBoe	Mar. 31, 2014 Multi-Counterparty Hedging Facility Semi-Annual Collateral Dates	Mar. 31, 2014 Multi-Counterparty Hedging Facility Between Semi-Annual Collateral Dates	Mar. 31, 2014 Swap USD ($)	Dec. 31, 2013 Swap USD ($)	Mar. 31, 2014 Basis Derivative [Member] Multi-Counterparty Hedging Facility MMBoe	Mar. 31, 2014 Price Risk Derivative [Member] Multi-Counterparty Hedging Facility MMBoe	Mar. 31, 2014 6.25% Euro-Denominated Senior Notes Due 2017 Senior Notes USD ($)	Dec. 31, 2013 6.25% Euro-Denominated Senior Notes Due 2017 Senior Notes USD ($)	Mar. 31, 2014 6.25% Euro-Denominated Senior Notes Due 2017 Senior Notes Cross Currency Interest Rate Contract [Member] USD ($)	Mar. 31, 2014 6.25% Euro-Denominated Senior Notes Due 2017 Senior Notes Cross Currency Interest Rate Contract [Member] EUR (€)	Dec. 31, 2013 6.25% Euro-Denominated Senior Notes Due 2017 Senior Notes Cross Currency Interest Rate Contract [Member] USD ($)	Mar. 31, 2014 6.25% Euro-Denominated Senior Notes Due 2017 Maturity Payment [Member] Senior Notes Cross Currency Interest Rate Contract [Member] USD ($)	Mar. 31, 2014 6.25% Euro-Denominated Senior Notes Due 2017 Maturity Payment [Member] Senior Notes Cross Currency Interest Rate Contract [Member] EUR (€)	Dec. 31, 2006 6.25% Euro-Denominated Senior Notes Due 2017 Senior Notes Cross Currency Interest Rate Contract [Member] USD ($)
Derivative [Line Items]
Interest Rate Derivatives, at Fair Value, Net								$ 80,000,000	$ 98,000,000
Derivative, Amount of Hedged Item								2,250,000,000	2,250,000,000
Number of counterparties in hedge facility			17	16
Multi-counterparty hedging facility, committed to provide a trading capacity (in tcfe)					1,063,000,000
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)										26,000,000	224,000,000
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	13,000,000
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%	7.491%
Derivative, Forward Exchange Rate														1.3769		1.3743			1.3325
Derivative liability, gross liability														7,000,000
Euro-denominated debt in notes payable, adjusted value	12,969,000,000	12,886,000,000										473,000,000	473,000,000	473,000,000
Derivative Instruments, Gain (Loss) Reclassification from AOCI to Income, Estimated Net Amount to be Transferred	148,000,000
Cash Flow Hedges, Accumulated OCI Balance	153,000,000
Expected amount to be transferred of during the next 12 months	$ 23,000,000