CONDENSED STATEMENTS OF CONSOLIDATED CASH FLOWS (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash Flows from Operating Activities:
Net income	$ 147	$ 120
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	66	60
Amortization of deferred financing costs	2	2
Deferred income taxes	88	71
Write-down of natural gas inventory	0	1
Equity in earnings of unconsolidated affiliate, net of distributions	(72)	(60)
Changes in other assets and liabilities, excluding acquisitions:
Accounts receivable and unbilled revenues, net	94	37
Accounts receivable/payable–affiliated companies	(5)	(6)
Inventory	70	108
Accounts payable	(148)	(65)
Fuel cost recovery	(6)	(3)
Interest and taxes accrued	(4)	3
Non-trading derivatives, net	(32)	8
Margin deposits, net	(46)	27
Other current assets	4	(3)
Other current liabilities	(11)	(2)
Other assets	13	5
Other liabilities	18	8
Other, net	2	2
Net cash provided by operating activities	180	313
Cash Flows from Investing Activities:
Capital expenditures	(98)	(98)
Distribution from unconsolidated affiliate in excess of cumulative earnings	74	74
Increase in notes receivable–affiliated companies	0	(24)
Decrease in notes receivable–unconsolidated affiliate	0	363
Acquisitions, net of cash acquired	(132)	0
Net cash provided by (used in) investing activities	(156)	315
Cash Flows from Financing Activities:
Decrease in short-term borrowings, net	(35)	(40)
Proceeds from (payments of) commercial paper, net	30	(219)
Dividends to parent	(108)	(363)
Debt issuance costs	0	(1)
Increase in notes payable–affiliated companies	52	0
Contribution from parent	38	0
Other, net	0	(1)
Net cash used in financing activities	(23)	(624)
Net Increase in Cash and Cash Equivalents	1	4
Cash and Cash Equivalents at Beginning of Period	1	0
Cash and Cash Equivalents at End of Period	2	4
Cash Payments:
Interest, net of capitalized interest	29	28
Non-cash transactions:
Accounts payable related to capital expenditures	$ 28	$ 28