STATEMENTS OF CONSOLIDATED CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash Flows from Operating Activities:
Net income (loss)	$ (912)	$ 323	$ 64
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	227	206	230
Amortization of deferred financing costs	9	9	11
Deferred income taxes	(542)	178	357
Write-down of natural gas inventory	4	8	4
Equity in (earnings) losses of unconsolidated affiliates, net of distributions	1,779	(2)	(58)
Changes in other assets and liabilities:
Accounts receivable and unbilled revenues, net	347	7	(220)
Accounts receivable/payable–affiliated companies	9	1	(2)
Inventory	35	(81)	(10)
Taxes receivable	0	18	(18)
Accounts payable	(221)	17	110
Fuel cost recovery	43	(41)	108
Interest and taxes accrued	58	(3)	33
Non-trading derivatives, net	(6)	(34)	4
Margin deposits, net	(4)	(79)	16
Other current assets	13	8	3
Other current liabilities	(11)	(6)	5
Other assets	(6)	(11)	(18)
Other liabilities	(5)	11	6
Other, net	(1)	6	10
Net cash provided by operating activities	816	535	635
Cash Flows from Investing Activities:
Capital expenditures	(606)	(512)	(495)
Distributions from unconsolidated affiliates in excess of cumulative earnings	148	0	0
Investment in unconsolidated affiliates	0	(1)	0
Cash contribution to Enable	0	0	(38)
Other, net	6	0	(3)
Net cash used in investing activities	(452)	(513)	(536)
Cash Flows from Financing Activities:
Increase (decrease) in short-term borrowings, net	(13)	10	5
Proceeds from (payments of) commercial paper, net	(122)	223	118
Proceeds from long-term debt	0	0	1,050
Payments of long-term debt	0	0	(525)
Cash paid for debt exchange	0	0	(5)
Dividends to parent	(43)	(405)	0
Increase (decrease) in notes payable–affiliated companies	(188)	150	(741)
Other, net	0	1	(1)
Net cash used in financing activities	(366)	(21)	(99)
Net Increase (Decrease) in Cash and Cash Equivalents	(2)	1	0
Cash and Cash Equivalents at Beginning of the Year	2	1	1
Cash and Cash Equivalents at End of the Year	0	2	1
Cash Payments:
Interest, net of capitalized interest	125	128	148
Income taxes (refunds), net	6	(1)	(5)
Non-cash transactions:
Accounts payable related to capital expenditures	37	37	21
Formation of Enable	0	0	4,252
Exercise of SESH put to Enable	$ 1	$ 196	$ 0