Consolidated Balance Sheet (Unaudited) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 112	$ 187
Accounts and notes receivable:
Trade	425	404
Affiliate	11	8
Inventories	182	195
Regulatory assets	43	51
Other current assets	81	53
Total current assets	854	898
Investments	1,313	1,045
Gross property, plant, and equipment	17,038	16,707
Less accumulated depreciation	(5,946)	(5,706)
Property, plant, and equipment - net	11,092	11,001
Regulatory assets, deferred charges, and other	464	460
Total assets	13,723	13,404
Accounts payable:
Trade	398	322
Affiliate	129	154
Accrued interest	103	105
Other accrued liabilities	214	174
Long-term debt due within one year	308	458
Total current liabilities	1,152	1,213
Long-term debt	6,716	6,365
Asset retirement obligations	467	460
Regulatory liabilities, deferred income, and other	325	290
Contingent liabilities (Note 8)
Equity:
Common units (290,477,159 units outstanding at June 30, 2011 and 289,844,575 units outstanding at December 31, 2010)	6,660	6,564
General partner	(1,594)	(1,485)
Accumulated other comprehensive income (loss)	(3)	(3)
Total equity	5,063	5,076
Total liabilities and equity	$ 13,723	$ 13,404