CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Operating Lease, Liability, Noncurrent	$ 5	$ 0
Operating Lease, Right-of-Use Asset	5	0
Current assets:
Cash and cash equivalents	0	20
Accounts receivable, net	45	43
Accounts receivable from related companies	9	11
Exchanges receivable	9	8
Inventories	61	98
Other current assets	7	6
Total current assets	131	186
Property, plant and equipment
Total property, plant and equipment	3,281	3,196
Accumulated depreciation	(607)	(507)
Net property, plant and equipment	2,674	2,689
Other Assets, Noncurrent	159	108
Goodwill	0	12
Total assets	2,969	2,995
Current liabilities:
Current maturities of long-term debt	0	152
Accounts payable	11	6
Accounts payable to related companies	34	46
Exchanges payable	47	85
Other current liabilities	70	69
Total current liabilities	162	358
Long-term debt, less current maturities	247	249
Note payable to related party	732	356
Deferred income taxes	0	437
Other non-current liabilities	221	233
Commitments and contingencies
Partners’ capital:
Partners’ capital	1,626	1,409
Accumulated other comprehensive loss	(24)	(47)
Total partners’ capital	1,602	1,362
Total liabilities and partners’ capital	$ 2,969	$ 2,995