Variable Interest Entities Narrative (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Variable Interest Entity [Line Items]
Other Commitment	$ 50
Chesapeake Granite Wash Trust | Consolidated Entities
Variable Interest Entity [Line Items]
Consolidation Net Oil and Gas Property Assets	337
Other current liabilities attributable to our VIEs	24
Cash and cash equivalents attributable to our VIEs	1
Short-term derivative liabilities attributable to our VIEs	7
Long-term derivative liabilities attributable to our VIEs	1
Mineral Acquisition Company I, L.P. | Corporate Ownership Requirement [Member]
Variable Interest Entity [Line Items]
Percentage of acquisition	10.00%
Mineral Acquisition Company I, L.P. | Corporate Ownership Requirement [Member] | Minimum
Variable Interest Entity [Line Items]
Percentage of royalty minimum	7.00%
Mineral Acquisition Company I, L.P. | Corporate Ownership Requirement [Member] | Maximum
Variable Interest Entity [Line Items]
Other Commitment	25
Percentage of royalty maximum	22.50%
Mineral Acquisition Company I, L.P. | Partner Ownership Requirement [Member] | Limited Partner [Member]
Variable Interest Entity [Line Items]
Percentage of acquisition	90.00%
Mineral Acquisition Company I, L.P. | Partner Ownership Requirement [Member] | Maximum | Limited Partner [Member]
Variable Interest Entity [Line Items]
Other Commitment	$ 225