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Fair Value Measurements (Details) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Level 1
Fair Value - Other Financial Instruments
Debt fair value	$ 7,800,000,000	$ 8,200,000,000
Debt carrying value	7,600,000,000	7,600,000,000
Recurring \| Level 1
Assets:
Commodity derivatives	246,000,000	107,000,000
Liabilities:
Commodity derivatives	224,000,000	99,000,000
Recurring \| Level 2
Assets:
Commodity derivatives	326,000,000	312,000,000
Liabilities:
Commodity derivatives	369,000,000	398,000,000
Recurring \| Netting and Collateral
Assets:
Commodity derivatives	(476,000,000)	(301,000,000)
Liabilities:
Commodity derivatives	(529,000,000)	(371,000,000)
Recurring \| Total Fair Value
Assets:
Commodity derivatives	96,000,000	118,000,000
Liabilities:
Commodity derivatives	$ 64,000,000	$ 126,000,000

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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