Note 10 - Commitments and Contingencies Operating Leases (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 17
Operating Leases, Future Minimum Payments, Due in Two Years	17
Operating Leases, Future Minimum Payments, Due in Three Years	15
Operating Leases, Future Minimum Payments, Due in Four Years	13
Operating Leases, Future Minimum Payments, Due in Five Years	13
Operating Leases, Future Minimum Payments, Due Thereafter	105
Operating Leases, Future Minimum Payments Due	180
Purchase Obligation, Due in Next Twelve Months	2,078
Purchase Obligation, Due in Second Year	2,084
Purchase Obligation, Due in Third Year	2,054
Purchase Obligation, Due in Fourth Year	2,013
Purchase Obligation, Due in Fifth Year	2,013
Purchase Obligation, Due after Fifth Year	1,673
Purchase Obligation	11,915
Contractual Obligation, Due in Next Fiscal Year	2,095
Contractual Obligation, Due in Second Year	2,101
Contractual Obligation, Due in Third Year	2,069
Contractual Obligation, Due in Fourth Year	2,026
Contractual Obligation, Due in Fifth Year	2,026
Contractual Obligation, Due after Fifth Year	1,778
Contractual Obligation	12,095
Operating Leases, Rent Expense	25	$ 19	$ 11
Unrecorded Unconditional Purchase Obligation, Purchases	311	$ 232	$ 192
Contractual Obligation, Future Minimum Payments Due, Remainder of Fiscal Year	297
Indemnification deductible	$ 1
Maximum
Lessee, Operating Lease, Term of Contract	26 years
Omnibus Agreement
Years To Identify Conditions For Indemnification	5 years
Keep-Whole Commodity Fee Agreement
Years To Identify Conditions For Indemnification	5 years
Los Angeles Logistics Assets [Member]
Years To Identify Conditions For Indemnification	10 years