CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
OPERATING REVENUES
Operating revenues	$ 1,723	$ 1,786
Operating revenues-affiliates	436	474
Total operating revenues	2,159	2,260
OPERATING EXPENSES
Cost of services and products (exclusive of depreciation and amortization)	645	743
Selling, general and administrative	269	339
Operating expenses-affiliates	162	144
Depreciation and amortization	530	568
Total operating expenses	1,606	1,794
OPERATING INCOME	553	466
OTHER INCOME (EXPENSE)
Interest expense	(108)	(113)
Interest expense-affiliates	(16)
Other income	1	1
Total other income (expense)	(123)	(112)
INCOME BEFORE INCOME TAX EXPENSE	430	354
Income tax expense	166	136
NET INCOME	$ 264	$ 218