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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2017
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
The following tables present assets and liabilities accounted for at fair value on a recurring basis as of September 30, 2017 and December 31, 2016 by fair value hierarchy level.
 
September 30, 2017
(In millions)
Level 1
 
Level 2
 
Level 3
 
Total
Derivative instruments, assets
 
 
 
 
 
 
 
     Commodity (a)
$
—

 
$
10

 
$
—

 
$
10

     Interest rate
—

 
—

 
—

 
—

Derivative instruments, assets
$
—

 
$
10

 
$
—

 
$
10

Derivative instruments, liabilities
 
 
 
 
 
 
 
     Commodity (a)
$
2

 
$
3

 
$
—

 
$
5

Derivative instruments, liabilities
$
2

 
$
3

 
$
—

 
$
5


(a)  
Derivative instruments are recorded on a net basis in our balance sheet. See Note 15.

 
December 31, 2016
(In millions)
Level 1
 
Level 2
 
Level 3
 
Total
Derivative instruments, assets
 
 
 
 
 
 
 
     Commodity (a)
$
—

 
$
—

 
$
—

 
$
—

Interest rate
—

 
68

 
—

 
68

Derivative instruments, assets
$
—

 
$
68

 
$
—

 
$
68

Derivative instruments, liabilities
 
 
 
 
 
 
 
     Commodity (a)
$
—

 
$
60

 
$
—

 
$
60

Derivative instruments, liabilities
$
—

 
$
60

 
$
—

 
$
60


(a)  
Derivative instruments are recorded on a net basis in our balance sheet. See Note 15.
Fair Value Measurements, Nonrecurring [Table Text Block]
The following table shows the values of assets, by major category, measured at fair value on a nonrecurring basis in periods subsequent to their initial recognition.
 
Three Months Ended September 30,
 
2017
 
2016
(In millions)
Fair Value
 
Impairment
 
Fair Value
 
Impairment
Long-lived assets
$
169

 
$
201

 
$
15

 
$
47


 
Nine Months Ended September 30,
 
2017
 
2016
(In millions)
Fair Value
 
Impairment
 
Fair Value
 
Impairment
Long-lived assets
$
169

 
$
205

 
$
15

 
$
48

.
 
Three Months Ended September 30,
 
2017
 
2016
(In millions)
Fair Value
 
Impairment
 
Fair Value
 
Impairment
Long-lived assets
$
169

 
$
201

 
$
15

 
$
47


 
Nine Months Ended September 30,
 
2017
 
2016
(In millions)
Fair Value
 
Impairment
 
Fair Value
 
Impairment
Long-lived assets
$
169

 
$
205

 
$
15

 
$
48


Long-lived assets that were impaired are discussed below. The fair values of each, unless otherwise noted, were measured using an income approach based upon internal estimates of future production levels, prices and discount rate, all of which are Level 3 inputs.  Inputs to the fair value measurement include reserve and production estimates made by our reservoir engineers, estimated future commodity prices adjusted for quality and location differentials and forecasted operating expenses for the remaining estimated life of the reservoir.
United States E&P
In the third quarter of 2017, impairments of $65 million were recorded consisting of certain proved properties in the Gulf of Mexico as a result of lower forecasted long-term commodity prices, to an aggregate fair value of $66 million.
In the third quarter of 2016, impairments of $47 million were recorded primarily consisting of conventional non-core proved properties in Oklahoma as a result of lower forecasted long-term commodity prices, to an aggregate fair value of $15 million.
International E&P
In the third quarter of 2017, we recorded proved property impairments of $136 million, to an aggregate fair value of $103 million, on certain non-core properties in our International E&P segment primarily as a result of lower forecasted long-term commodity prices and as a result of the anticipated sales of certain non-core international assets. The fair values were measured using the market approach, based upon either anticipated sales proceeds less costs to sell or a market comparable sales price per boe. This resulted in a Level 2 classification. See Note 6 for further information about the divestment of certain non-core properties in our International E&P segment.
Canadian discontinued operations
As a result of our announced disposition of our Canadian business in the first quarter of 2017, we recorded a pre-tax non-cash impairment charge of $6.6 billion primarily related to property, plant and equipment. This impairment was recorded for excess net book value over anticipated sales proceeds less costs to sell. Fair values of assets held for sale were determined based upon the anticipated sales proceeds less costs to sell, which resulted in a Level 2 classification. See Note 6 for relevant detail regarding dispositions.
Fair Value, by Balance Sheet Grouping [Table Text Block]
The following table summarizes financial instruments, excluding receivables, payables and derivative financial instruments, and their reported fair values by individual balance sheet line item at September 30, 2017 and December 31, 2016.
 
September 30, 2017
 
December 31, 2016
 
Fair
 
Carrying
 
Fair
 
Carrying
(In millions)
Value
 
Amount
 
Value
 
Amount
Financial assets
 
 
 
 
 
 
 
Current assets (a)
$
755

 
$
754

 
$
7

 
$
7

Other noncurrent assets
127

 
128

 
105

 
108

Total financial assets  
$
882

 
$
882

 
$
112

 
$
115

Financial liabilities
 

 
 

 
 

 
 

     Other current liabilities
$
44

 
$
55

 
$
68

 
$
75

     Long-term debt, including current portion (b)
6,781

 
6,527

 
7,449

 
7,292

Deferred credits and other liabilities
112

 
105

 
114

 
107

Total financial liabilities  
$
6,937

 
$
6,687

 
$
7,631

 
$
7,474

(a)    Includes our two notes receivable relating to the sale of our Canadian business as of September 30, 2017, see note 6 for further information.
(b) Excludes capital leases, debt issuance costs and interest rate swap adjustments.