XML 36 R12.htm IDEA: XBRL DOCUMENT v3.3.1.900
Capitalized Exploratory Well Costs
 12 Months Ended
Dec. 31, 2015
Capitalized Exploratory Well Costs [Abstract]  
Suspended Well Costs Disclosure [Text Block]

Net changes in capitalized exploratory well costs are presented in the table below. The balances at December 31, 2015, 2014 and 2013, represent the amount of capitalized exploratory well costs that are pending the determination of proved reserves.
 
2015
 
2014
 
2013
 
(in millions)
Balance at January 1,
$
12.6

 
$
2.6

 
$
2.1

Additions to capitalized exploratory well costs pending the determination of proved reserves
6.0

 
13.7

 
2.7

Reclassifications to proved properties after the determination of proved reserves
(16.0
)
 
—

 
(2.2
)
Capitalized exploratory well costs charged to expense
—

 
(3.7
)
 
—

Balance at December 31,
$
2.6

 
$
12.6

 
$
2.6