CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 0	$ 0
Accounts receivable, net	43	50
Accounts receivable from related companies	8	8
Exchanges receivable	18	7
Inventories	54	57
Other current assets	4	5
Total current assets	127	127
Property, Plant and Equipment, Net [Abstract]
Property, plant and equipment	3,429	3,421
Accumulated depreciation	(838)	(813)
Property, Plant and Equipment, Net, Total	2,591	2,608
Operating Lease, Right-of-Use Asset	3	4
Other non-current assets, net	201	192
Total assets	2,922	2,931
Liabilities, Current [Abstract]
Accounts Payable and Accrued Liabilities, Current	2	39
Accounts Payable, Related Parties, Current	72	25
Exchanges payable	17	22
Other Liabilities, Current	64	62
Liabilities, Current, Total	155	148
Long-term Debt and Lease Obligation	243	243
Notes Payable, Related Parties, Noncurrent	127	221
Operating Lease, Liability, Noncurrent	3	3
Other Liabilities, Noncurrent	336	312
Commitments and Contingencies
Partners' Capital [Abstract]
Partners' Capital	2,051	2,001
Accumulated Other Comprehensive Income (Loss), Net of Tax	7	3
Partners' Capital, Total	2,058	2,004
Liabilities and Equity, Total	$ 2,922	$ 2,931