Basis of Presentation Discontinued Operations (Details) $ in Millions		3 Months Ended		9 Months Ended
	Sep. 25, 2013 bbl	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)
Discontinued Operations
Earnings (loss) from discontinued operations, net of tax		$ 8	$ (1)	$ 8	$ 10
Hawaii Operations
Discontinued Operations
Cash Provided by (Used in) Operating Activities, Discontinued Operations				(17)	2
Disposal Date	Sep. 25, 2013
Throughput Capacity | bbl	94,000
Revenues					0
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax		13	1	13	16
Earnings (loss) from discontinued operations, net of tax		$ 8	$ 1	$ 8	$ 10