Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Current Assets:
Cash and cash equivalents	$ 7	$ 5
Restricted cash (Note 1)	14	14
Accounts receivable, net of allowance for doubtful accounts (Note 1)	287	277
Accounts receivable—affiliated companies	21	18
Inventory	41	40
Gas imbalances	29	37
Other current assets	33	25
Total current assets	432	416
Property, Plant and Equipment:
Property, plant and equipment	12,443	12,079
Less accumulated depreciation and amortization	1,880	1,724
Property, plant and equipment, net	10,563	10,355
Other Assets:
Intangible assets, net	429	451
Goodwill	12	12
Investment in equity method affiliate	315	324
Other	41	35
Total other assets	797	822
Total Assets	11,792	11,593
Current Liabilities:
Accounts payable	244	263
Accounts payable—affiliated companies	3	3
Current portion of long-term debt	499	450
Short-term debt	327	405
Taxes accrued	39	32
Gas imbalances	16	12
Other	130	114
Total current liabilities	1,258	1,279
Other Liabilities:
Accumulated deferred income taxes, net	6	6
Regulatory liabilities	22	21
Other	54	38
Total other liabilities	82	65
Long-Term Debt	2,881	2,595
Commitments and Contingencies (Note 13)
Partners’ Equity:
Series A Preferred Units (14,520,000 issued and outstanding at June 30, 2018 and December 31, 2017)	362	362
Common units	7,198	7,280
Noncontrolling interest	11	12
Total Partners’ Equity	7,571	7,654
Total Liabilities and Partners’ Equity	$ 11,792	$ 11,593