The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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Name:	us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Aruba Disposition (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
Aruba Disposition (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Aruba Disposition (Textual)
Tax benefit on disposition		$ (879)	$ 949	$ (765)
Asset impairment loss		$ 0	$ 0	56
Aruba Terminal [Member]
Aruba Disposition (Textual)
Asset impairment loss	$ 56
Refining [Member] \| Aruba Terminal [Member]
Aruba Disposition (Textual)
Asset impairment loss	$ 56
Refining [Member] \| Aruba Disposition [Member]
Aruba Disposition (Textual)
Tax benefit on disposition				$ 42