Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 14	$ 1
Accounts receivable:
Trade, net of allowance for doubtful accounts of $4 and $3 million, respectively	528	726
Affiliates	150	138
Other	16	14
Inventories	28	46
Unrealized gains on derivative instruments	91	32
Collateral cash deposits	21	111
Other	18	12
Total current assets	866	1,080
Property, plant and equipment, net	8,046	8,811
Goodwill	0	159
Intangible assets, net	46	61
Investments in unconsolidated affiliates	3,668	3,724
Unrealized gains on derivative instruments	40	2
Operating lease assets	83	107
Other long-term assets	165	183
Total assets	12,914	14,127
Accounts payable:
Trade	394	638
Affiliates	119	100
Other	23	35
Current debt	504	603
Unrealized losses on derivative instruments	83	58
Accrued interest	73	80
Accrued taxes	68	65
Accrued wages and benefits	47	58
Capital spending accrual	4	28
Other	98	128
Total current liabilities	1,413	1,793
Long-term debt	5,244	5,321
Unrealized losses on derivative instruments	29	20
Deferred income taxes	30	30
Operating lease liabilities	76	88
Other long-term liabilities	240	242
Total liabilities	7,032	7,494
Equity:
Limited partners (208,329,928 common units authorized, issued and outstanding, respectively)	5,100	5,861
Accumulated other comprehensive loss	(7)	(7)
Total partners’ equity	5,854	6,605
Noncontrolling interests	28	28
Total equity	5,882	6,633
Total liabilities and equity	12,914	14,127
Allowance for Doubtful Accounts Receivable, Current	$ 4	3
Common unitholders, units outstanding (in shares)	208,329,928
Common unitholders, units issued (in shares)	208,351,528
Series A Preferred Limited Partners [Member]
Equity:
Preferred Units, Preferred Partners' Capital Accounts	$ 499	489
Total equity	$ 499	$ 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