|
Property, Plant and Equipment (Details) (USD $)
|
3 Months Ended |
|
|
Mar. 31, 2015
|
Mar. 31, 2014
|
Dec. 31, 2014
|
| Unproved Oil and Natural Gas Properties |
|
|
|
| Total property, plant and equipment, net |
$ 8,915,000,000 |
|
$ 8,728,000,000 |
| Restructuring Cost and Reserve [Line Items] |
|
|
|
| Property, plant, and equipment associated with unproven oil and natural gas properties |
500,000,000 |
|
700,000,000 |
| Transfer from unproved properties to proved properties |
200,000,000 |
|
|
| Amortization of unproved leasehold costs |
4,000,000 |
7,000,000 |
|
| Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
|
|
|
| Projected inflation rate (as a percent) |
2.50% |
|
|
| Changes in net asset retirement liability |
|
|
|
| Net asset retirement liability at January 1 |
42,000,000 |
|
|
| Liabilities incurred |
1,000,000 |
|
|
| Liabilities settled |
(1,000,000) |
|
|
| Accretion expense |
1,000,000 |
|
|
| Net asset retirement liability at March 31, 2015 |
43,000,000 |
|
|
| Capitalized Interest |
|
|
|
| Capitalized interest |
4,000,000 |
5,000,000 |
|
| Minimum |
|
|
|
| Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
|
|
|
| Credit-adjusted risk-free rate (as a percent) |
7.00% |
|
|
| Maximum |
|
|
|
| Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
|
|
|
| Credit-adjusted risk-free rate (as a percent) |
9.00% |
|
|
| Wolfcamp |
|
|
|
| Restructuring Cost and Reserve [Line Items] |
|
|
|
| Property, plant, and equipment associated with unproven oil and natural gas properties |
400,000,000 |
|
|
| Altamont |
|
|
|
| Restructuring Cost and Reserve [Line Items] |
|
|
|
| Property, plant, and equipment associated with unproven oil and natural gas properties |
$ 100,000,000 |
|
|