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Segment Information (Tables)
 12 Months Ended
Dec. 31, 2018
Segment Reporting [Abstract]  
Segment Information
 
 
 
Oil and Gas Exploration and Production
 
Midstream
 
 
(millions)
Consolidated
 
United
States
 
Eastern
Mediter- ranean
 
West
Africa
 
Other Int'l
 
United States
 
Intersegment Eliminations and Other (1)
 
Corporate
Year Ended December 31, 2018
Crude Oil Sales
$
2,945

 
$
2,548

 
$
7

 
$
390

 
$
—

 
$
—

 
$
—

 
$
—

NGL Sales
587

 
587

 
—

 
—

 
—

 
—

 
—

 
—

Natural Gas Sales
929

 
435

 
473

 
21

 
—

 
—

 
—

 
—

Total Crude Oil, NGL and Natural Gas Sales
4,461

 
3,570

 
480

 
411

 
—

 
—

 
—

 
—

Sales of Purchased Oil and Gas
275

 
20

 
—

 
—

 
—

 
142

 
—

 
113

Income from Equity Method Investees
172

 
—

 
—

 
132

 
—

 
40

 
—

 
—

Midstream Services Revenues - Third Party
78

 
—

 
—

 
—

 
—

 
78

 
—

 
—

Intersegment Revenues
—

 


 


 


 


 
351

 
(351
)
 


Total Revenues
4,986

 
3,590

 
480

 
543

 
—

 
611

 
(351
)
 
113

Lease Operating Expense
576

 
480

 
26

 
97

 
—

 
—

 
(27
)
 
—

Production and Ad Valorem Taxes
190

 
184

 
—

 
—

 
—

 
6

 
—

 
—

Gathering, Transportation and Processing Expense
393

 
533

 
—

 
—

 
—

 
95

 
(235
)
 
—

Other Royalty Expense
38

 
38

 
—

 
—

 
—

 
—

 
—

 
—

Total Production Expense
1,197

 
1,235

 
26

 
97

 
—

 
101

 
(262
)
 
—

Exploration Expense
129

 
48

 
7

 
6

 
68

 
—

 
—

 
—

DD&A
1,934

 
1,642

 
60

 
115

 
2

 
87

 
(20
)
 
48

(Gain) Loss on Divestitures, Net
(843
)
 
36

 
(376
)
 
—

 
—

 
(503
)
 
—

 
—

Asset Impairments
206

 
169

 
—

 
—

 
—

 
37

 
—

 
—

Goodwill Impairment
1,281

 
1,281

 
—

 
—

 
—

 
—

 
—

 
—

Cost of Purchased Oil and Gas
296

 
20

 
—

 
—

 
—

 
136

 
—

 
140

Gain on Asset Retirement Obligation Revisions
(25
)
 
—

 
(8
)
 
—

 
(17
)
 
—

 
—

 
—

(Gain) Loss on Commodity Derivative Instruments
(63
)
 
(70
)
 
—

 
7

 
—

 
—

 
—

 
—

Income (Loss) Before Income Taxes
140

 
(875
)
 
742

 
305

 
(53
)
 
726

 
(60
)
 
(645
)
Additions to Long Lived Assets
3,253

 
2,115

 
671

 
12

 
—

 
521

 
(91
)
 
25

Property, Plant and Equipment, Net
18,419

 
13,044

 
2,630

 
805

 
37

 
1,742

 
(145
)
 
306

Year Ended December 31, 2017
Crude Oil Sales
$
2,346

 
$
1,993

 
$
6

 
$
347

 
$
—

 
$
—

 
$
—

 
$
—

NGL Sales
493

 
493

 
—

 
—

 
—

 
—

 
—

 
—

Natural Gas Sales
1,221

 
670

 
528

 
23

 
—

 
—

 
—

 
—

Total Crude Oil, NGL and Natural Gas Sales
4,060

 
3,156

 
534

 
370

 
—

 
—

 
—

 
—

Income from Equity Method Investees
177

 
—

 
—

 
120

 
—

 
57

 
—

 
—

Midstream Services Revenues - Third Party
19

 
—

 
—

 
—

 
—

 
19

 
—

 
—

Intersegment Revenues
—

 
—

 
—

 
—

 
—

 
277

 
(277
)
 
—

Total Revenues
4,256

 
3,156

 
534

 
490

 
—

 
353

 
(277
)
 
—

 
 
 
Oil and Gas Exploration and Production
 
Midstream
 
 
(millions)
Consolidated
 
United
States
 
Eastern
Mediter- ranean
 
West
Africa
 
Other Int'l
 
United States
 
Intersegment Eliminations and Other (1)
 
Corporate
Lease Operating Expense
571

 
466

 
29

 
90

 
—


—

 
(14
)
 
—

Production and Ad Valorem Taxes
118

 
115

 
—

 
—

 
—

 
3

 
—

 
—

Gathering, Transportation and Processing Expense
432

 
550

 
—

 
—

 
—

 
70

 
(188
)
 
—

Other Royalty Expense
20

 
20

 
—

 
—

 
—

 
—

 
—

 
—

Total Production Expense
1,141

 
1,151

 
29

 
90

 
—

 
73

 
(202
)
 
—

Exploration Expense
188

 
102

 
2

 
5

 
79

 
—

 
—

 
—

DD&A
2,053

 
1,739

 
76

 
146

 
4

 
30

 
(5
)
 
63

Loss on Marcellus Shale Upstream Divestiture and Other
2,379

 
2,286

 
—

 
—

 
—

 
—

 
—

 
93

Gain on Divestitures, Net
(326
)
 
(325
)
 
(1
)
 
—

 
—

 
—

 
—

 
—

Asset Impairments 
70

 
63

 
—

 
—

 
7

 
—

 
—

 
—

Clayton Williams Energy Acquisition Expenses
100

 
100

 
—

 
—

 
—

 
—

 
—

 
—

Gain on Asset Retirement Obligation Revision
(42
)
 
—

 
—

 
—

 
(42
)
 
—

 
—

 
—

(Gain) Loss on Commodity Derivative Instruments
(63
)
 
(92
)
 
—

 
29

 
—

 
—

 
—

 
—

Loss on Debt Extinguishment
98

 
—

 
—

 
—

 
—

 
—

 
—

 
98

(Loss) Income Before Income Taxes
(2,191
)
 
(2,365
)
 
413

 
203

 
(54
)
 
233

 
(62
)
 
(559
)
Additions to Long Lived Assets
2,851

 
1,994

 
411

 
34

 
(34
)
 
423

 
(79
)
 
102

Property, Plant and Equipment, Net
17,502

 
13,348

 
2,005

 
863

 
25

 
1,027

 
(74
)
 
308

Year Ended December 31, 2016
Crude Oil Sales
$
1,854

 
$
1,439

 
$
5

 
$
410

 
$
—

 
$
—

 
$
—

 
$
—

NGL Sales
296

 
296

 
—

 
—

 
—

 
—

 
—

 
—

Natural Gas Sales
1,239

 
681

 
535

 
23

 
—

 
—

 
—

 
—

Total Crude Oil, NGL and Natural Gas Sales
3,389

 
2,416

 
540

 
433

 
—

 
—

 
—

 
—

Income from Equity Method Investees
102

 
—

 
—

 
50

 
—

 
52

 
—

 
—

Intersegment Revenues
—

 
—

 
—

 
—

 
—

 
200

 
(200
)
 
—

Total Revenues
3,491

 
2,416

 
540

 
483

 
—

 
252

 
(200
)
 
—

Lease Operating Expense
542

 
418

 
37

 
105

 
—

 
—

 
(18
)
 
—

Production and Ad Valorem Taxes
57

 
55

 
—

 
—

 
—

 
2

 
—

 
—

Gathering, Transportation and Processing Expense
480

 
564

 
—

 
—

 
—

 
44

 
(128
)
 
—

Other Royalty Expense
21

 
21

 
—

 
—

 
—

 
—

 
—

 
—

Total Production Expense
1,100

 
1,058

 
37

 
105

 
—

 
46

 
(146
)
 
—

Exploration Expense
925

 
245

 
34

 
483

 
163

 
—

 
—

 
—

DD&A
2,454

 
2,103

 
81

 
205

 
6

 
19

 
—

 
40

(Gain) Loss on Divestitures, Net
(238
)
 
23

 
(261
)
 
—

 
—

 
—

 
—

 
—

Asset Impairments
92

 
—

 
88

 
—

 
4

 
—

 
—

 
—

 
 
 
Oil and Gas Exploration and Production
 
Midstream
 
 
(millions)
Consolidated
 
United
States
 
Eastern
Mediter- ranean
 
West
Africa
 
Other Int'l
 
United States
 
Intersegment Eliminations and Other (1)
 
Corporate
Loss on Commodity Derivative Instruments
139

 
126

 
—

 
13

 
—

 
—

 
—

 
—

(Loss) Income Before Income Taxes
(1,772
)
 
(1,277
)
 
543

 
(338
)
 
(199
)
 
176

 
(51
)
 
(626
)
Additions to Long Lived Assets
1,526

 
1,353

 
88

 
54

 
(6
)
 
58

 
(53
)
 
32

Property, Plant and Equipment, Net
18,548

 
14,755

 
1,872

 
980

 
15

 
594

 
—

 
332

(1)
Intersegment eliminations related to income (loss) before income taxes are the result of Midstream expenditures. These costs are presented as property, plant and equipment within the E&P business on an unconsolidated basis, in accordance with the successful efforts method of accounting, and are eliminated upon consolidation.
Concentrations of Revenue by Customer and Production The largest single non-affiliated purchasers of our production were as follows:
 
 
Percentage of Crude Oil Sales
 
Percentage of Total Oil, NGL & Gas Sales
Year Ended December 31, 2018
 
 
 
 
BP (1)
 
31
%
 
17
%
Shell (2)
 
22
%
 
14
%
Year Ended December 31, 2017
 
 
 
 
BP (1)
 
15
%
 
10
%
Shell (2)
 
22
%
 
13
%
Year Ended December 31, 2016
 
 
 
 
Glencore Energy UK Ltd
 
22
%
 
12
%
Shell (2)
 
24
%
 
13
%
(1) Includes sales to BP North American Funding Company, BP Company Commercial and/or BP Company.
(2) Includes sales to Shell Trading (US) Company and/or Shell International Trading and Shipping Limited.