Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 12	$ 1
Accounts receivable:
Trade, net of allowance for doubtful accounts of $3 and $3 million, respectively	488	726
Affiliates	111	138
Other	14	14
Inventories	28	46
Unrealized gains on derivative instruments	98	32
Collateral cash deposits	21	111
Other	30	12
Total current assets	802	1,080
Property, plant and equipment, net	8,116	8,811
Goodwill	0	159
Intangible assets, net	47	61
Investments in unconsolidated affiliates	3,696	3,724
Unrealized gains on derivative instruments	29	2
Operating lease assets	91	107
Other long-term assets	165	183
Total assets	12,946	14,127
Accounts payable:
Trade	360	638
Affiliates	102	100
Other	22	35
Current debt	3	603
Unrealized losses on derivative instruments	66	58
Accrued interest	71	80
Accrued taxes	52	65
Accrued wages and benefits	29	58
Capital spending accrual	5	28
Other	102	128
Total current liabilities	812	1,793
Long-term debt	5,897	5,321
Unrealized losses on derivative instruments	37	20
Deferred income taxes	30	30
Operating lease liabilities	76	88
Other long-term liabilities	235	242
Total liabilities	7,087	7,494
Equity:
Limited partners (208,329,928 common units authorized, issued and outstanding, respectively)	5,086	5,861
Accumulated other comprehensive loss	(7)	(7)
Total partners’ equity	5,831	6,605
Noncontrolling interests	28	28
Total equity	5,859	6,633
Total liabilities and equity	12,946	14,127
Allowance for Doubtful Accounts Receivable, Current	$ 3	3
Common unitholders, units outstanding (in shares)	208,329,928
Common unitholders, units issued (in shares)	208,329,928
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 27	1
Series A Preferred Limited Partners [Member]
Equity:
Preferred Units, Preferred Partners' Capital Accounts	490	489
Total equity	$ 490	$ 489
Preferred Units, Issued	500,000	500,000
Preferred Units, Outstanding	500,000	500,000
Series B Preferred Limited Partners [Member]
Equity:
Preferred Units, Preferred Partners' Capital Accounts	$ 156	$ 156
Total equity	$ 156	$ 156
Preferred Units, Issued	6,450,000	6,450,000
Preferred Units, Outstanding	6,450,000	6,450,000
Series C Preferred Limited Partners [Member]
Equity:
Preferred Units, Preferred Partners' Capital Accounts	$ 106	$ 106
Total equity	$ 106	$ 106
Preferred Units, Issued	4,400,000	4,400,000
Preferred Units, Outstanding	4,400,000	4,400,000