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Organization and Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2014
Accounting Policies [Abstract]  
Change in ARO (asset retirement obligation)
The change in our ARO for continuing operations for each of the three years ended December 31, is set forth below:
 
 
 
2014
 
2013
 
2012
 
 
(In millions)
Balance at January 1
 
$
122

 
$
102

 
$
108

Accretion expense
 
8

 
8

 
8

Additions(1)
 
58

 
12

 
20

Revisions
 
16

 
8

 
12

Settlements(2)
 
(18
)
 
(8
)
 
(46
)
Balance at December 31
 
186

 
122

 
102

Less: Current portion of ARO at December 31
 
(3
)
 
(5
)
 
(5
)
Total long-term ARO at December 31
 
$
183

 
$
117

 
$
97

_________________
(1)
For the year ended December 31, 2014, additions include $28 million for our Pearl development in offshore China and $30 million for abandonment obligations in our domestic business.
(2)
For the year ended December 31, 2014, settlements include $10 million related to the sale of our Granite Wash assets. For the year ended December 31, 2012, settlements include $28 million related to the sale of our Gulf of Mexico assets. See Note 4, “Oil and Gas Assets.”
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The change in AOCI for the indicated periods is set forth below:
 
 
Unrealized Gains / (Losses) in
Accumulated Other Comprehensive Income
 
 
Available-for-Sale Securities
 
Post-Retirement Benefits
 
Total
 
 
(In millions, net of tax)
Balance at January 1, 2012
 
$
(9
)
 
$
(1
)
 
$
(10
)
Current period other comprehensive income (loss)
 
3

 
—

 
3

Balance at December 31, 2012
 
(6
)
 
(1
)
 
(7
)
Other comprehensive income before reclassifications
 
3

 
2

 
5

Amounts reclassified from accumulated other comprehensive income
 
4

 
—

 
4

Net current period other comprehensive income (loss)
 
7

 
2

 
9

Balance at December 31, 2013
 
1

 
1

 
2

Current period other comprehensive income (loss)
 
—

 
(3
)
 
(3
)
Balance at December 31, 2014
 
$
1

 
$
(2
)
 
$
(1
)