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Segment Information (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Segment Information [Line Items]      
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]
 
 
Domestic
 
China
 
Total
 
 
(In millions)
Three Months Ended March 31, 2018:
 
 
 
 
 
 
Revenues
 


 


 


Oil
 
$
375

 
$
17

 
$
392

Gas
 
97

 
—

 
97

NGL
 
89

 
—

 
89

Oil, gas and NGL revenues
 
561

 
17

 
578

 
 
 
 
 
 
 
Lease operating
 
54

 
4

 
58

Transportation and processing
 
78

 
—

 
78

Production and other taxes
 
24

 
—

 
24

Depreciation, depletion and amortization
 
129

 
4

 
133

Results of operations for oil and gas producing activities before tax
 
276

 
9

 
285

 
 
 
 
 
 
 
Other revenues
 
2

 
—

 
2

General and administrative
 
52

 
2

 
54

Other
 
1

 
—

 
1

Allocated income tax (benefit)(1)
 
52

 
3

 
 
Net income (loss) from oil and gas properties
 
$
173

 
$
4

 
 
 
 
 
 
 
 
 
Total revenues
 
 
 
 
 
$
580

Total operating expenses
 
 
 
 
 
348

Income (loss) from operations
 
 
 
 
 
232

Interest expense, net of interest income, capitalized interest and other
 
 
 
 
 
(22
)
Commodity derivative income (expense)
 
 
 
 
 
(111
)
Income (loss) from operations before income taxes
 
 
 
 
 
$
99

Total assets
 
$
5,022

 
$
100

 
$
5,122

Additions to long-lived assets
 
$
378

 
$
—

 
$
378
 
 
Domestic
 
China
 
Total
 
 
(In millions)
Three Months Ended March 31, 2017:
 
 
 
 
 
 
Revenues:
 


 


 


Oil
 
$
230

 
$
34

 
$
264

Gas
 
86

 
—

 
86

NGL
 
66

 
—

 
66

Oil, gas and NGL revenues
 
382

 
34

 
416

 
 
 
 
 
 
 
Lease operating
 
48

 
8

 
56

Transportation and processing
 
72

 
—

 
72

Production and other taxes
 
14

 
—

 
14

Depreciation, depletion and amortization
 
96

 
10

 
106

Results of operations for oil and gas producing activities before tax
 
152

 
16

 
168

 
 
 
 
 
 
 
Other revenues
 
1

 
—

 
1

General and administrative
 
46

 
1

 
47

Other
 
1

 
—

 
1

Allocated income tax (benefit)(1)
 
39

 
9

 

Net income (loss) from oil and gas properties
 
$
67

 
$
6

 
 
 
 
 
 
 
 
 
Total revenues
 
 
 
 
 
$
417

Total operating expenses
 
 
 
 
 
296

Income (loss) from operations
 
 
 
 
 
121

Interest expense, net of interest income, capitalized interest and other
 
 
 
 
 
(20
)
Commodity derivative income (expense)
 
 
 
 
 
53

Income (loss) from operations before income taxes
 
 
 
 
 
$
154

Total assets
 
$
4,248

 
$
140

 
$
4,388

Additions to long-lived assets
 
$
246

 
$
—

 
$
246


  
Oil Revenue $ 392 $ 264  
Gas Revenue 97 86  
NGL Revenue 89 66  
Oil, gas and NGL revenue, excluding Other Revenue 578 416  
Oil, gas and NGL revenues 580 417  
Operating expenses:      
Lease operating 58 56  
Transportation and processing 78 72  
Production and other taxes 24 14  
Depreciation, depletion and amortization 133 106  
General and administrative 54 47  
Other 1 1  
Allocated income tax (benefit) 13 7  
Total operating expenses 348 296  
Income (loss) of Oil and Gas Operating before tax 285 168  
Other Non Oil and Gas Revenue 2 1  
Income (loss) from operations 232 121  
Interest expenses, net of interest income, capitalized interest and other (22) (20)  
Commodity derivative income (expense) (111) 53  
Income (loss) before income taxes 99 154  
Total assets 5,122 4,388 $ 4,961
Additions to long-lived assets $ 378 246  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00%    
UNITED STATES      
Segment Information [Line Items]      
Oil Revenue $ 375 230  
Gas Revenue 97 86  
NGL Revenue 89 66  
Oil, gas and NGL revenue, excluding Other Revenue 561 382  
Operating expenses:      
Lease operating 54 48  
Transportation and processing 78 72  
Production and other taxes 24 14  
Depreciation, depletion and amortization 129 96  
General and administrative 52 46  
Other 1 1  
Allocated income tax (benefit) 52 39  
Net income (loss) from oil and gas properties 173 67  
Income (loss) of Oil and Gas Operating before tax 276 152  
Other Non Oil and Gas Revenue 2 1  
Total assets 5,022 4,248  
Additions to long-lived assets $ 378 $ 246  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 23.00% 37.00%  
CHINA      
Segment Information [Line Items]      
Oil Revenue $ 17 $ 34  
Gas Revenue 0 0  
NGL Revenue 0 0  
Oil, gas and NGL revenue, excluding Other Revenue 17 34  
Operating expenses:      
Lease operating 4 8  
Transportation and processing 0 0  
Production and other taxes 0 0  
Depreciation, depletion and amortization 4 10  
General and administrative 2 1  
Other 0 0  
Allocated income tax (benefit) 3 9  
Net income (loss) from oil and gas properties 4 6  
Income (loss) of Oil and Gas Operating before tax 9 16  
Other Non Oil and Gas Revenue 0 0  
Total assets 100 140  
Additions to long-lived assets $ 0 $ 0  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 46.00% 60.00%