Suspended Exploratory Well Costs - Amount Capitalized Cost (Details)	12 Months Ended
Dec. 31, 2016 item
SUSPENDED EXPLORATORY WELL COSTS
Number of wells, transferred	1

Number of wells, transferred to oil ad gas assets of project received.

No definition available.

Name:	su_NumberOfWellsTransferredToOilAndGasAssets
Namespace Prefix:	su_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration