CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
OPERATING ACTIVITIES
Net income	$ 194	$ 197
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	2,049	2,206
Deferred income taxes	96	117
Provision for uncollectible accounts	57	73
Long-term debt premium amortization	(47)	(67)
Net loss on early retirement of debt	0	38
Changes in current assets and current liabilities:
Accounts receivable	(80)	(80)
Accounts payable	(2)	(51)
Accounts receivable and payable-affiliates, net	0	(307)
Accrued income and other taxes	18	(1)
Other current assets and other current liabilities, net	249	66
Retirement benefits	(99)	(96)
Changes in other noncurrent assets and liabilities, net	(18)	(80)
Other, net	8	2
Net cash provided by operating activities	2,425	2,017
INVESTING ACTIVITIES
Payments for property, plant and equipment and capitalized software	(1,266)	(1,121)
Changes in advances to affiliates	(1,707)	(28)
Proceeds from sale of property	0	133
Net cash used in investing activities	(2,973)	(1,016)
FINANCING ACTIVITIES
Net proceeds from issuance of long-term debt	752	896
Payments of long-term debt	(835)	(2,761)
Early retirement of debt costs	0	(178)
Payments of Distributions to Affiliates	0	(750)
Changes in notes payable-affiliates	676	1,985
Changes in advances from affiliates	(20)	(187)
Net cash provided by (used in) financing activities	573	(995)
Net (decrease) increase in cash and cash equivalents	25	6
Cash and cash equivalents at beginning of period	87	48
Cash and cash equivalents at end of period	112	54
Supplemental cash flow information:
Income taxes refunded (paid), net	(1)	1
Interest (paid) (net of capitalized interest of $19 and $19)	$ (501)	$ (585)