Other Liabilities, Long-Term Table (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2013 Property	Dec. 31, 2011 Property	Dec. 31, 2009 Property	Dec. 31, 2012
Other Long-Term Liabilities [Line Items]
Financing obligations(c)	$ 191			$ 175
Mortgages payable(d)	0			56
Other	580			506
Total other long-term liabilities	1,180			1,176
Other liabilities, current	3,625			3,741
Number Of Real Estate Assets Financed			111
Operating Leases, Income Statement, Minimum Lease Revenue			145
Lease Agreement Contractual Term			40 years
Capital Leases, Future Minimum Payments Receivable			54
Number Of Real Estate Surface Assets Repurchased	4	1
Mortgage Term			5 years
Debt Instrument, Basis Points			275
Minimum
Other Long-Term Liabilities [Line Items]
Capital Leases, Future Minimum Payments Receivable			15
Maximum
Other Long-Term Liabilities [Line Items]
Capital Leases, Future Minimum Payments Receivable			27
Chesapeake Utica L L C [Member]
Other Long-Term Liabilities [Line Items]
Conveyance Obligation Noncurrent	256			275
Total other long-term liabilities	279			293
Other liabilities, current	23			18
Chesapeake Cleveland Tonkawa L.L.C
Other Long-Term Liabilities [Line Items]
Conveyance Obligation Noncurrent	153			164
Total other long-term liabilities	163			178
Other liabilities, current	$ 10			$ 14