Financial Instruments (Unaudited) Oil and Gas (Details) (USD $)
In Millions, unless otherwise specified |
6 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||
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Jun. 30, 2013
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Dec. 31, 2012
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Jun. 30, 2013
Derivatives not designated as hedging instruments [Member]
Crude Oil Swaps [Member]
MMBbls
|
Jun. 30, 2013
Derivatives not designated as hedging instruments [Member]
Natural gas swaps [Member]
MMBTU
|
Jun. 30, 2013
2013 Positions [Member]
Derivatives not designated as hedging instruments [Member]
Crude Oil Swaps [Member]
MBbls
|
Jun. 30, 2013
2013 Positions [Member]
Derivatives not designated as hedging instruments [Member]
Crude Oil Options [Member]
13 MBbls [Member]
Put Option [Member]
MBbls
|
Jun. 30, 2013
2013 Positions [Member]
Derivatives not designated as hedging instruments [Member]
Crude Oil Options [Member]
25 MBbls [Member]
Three-way Collars [Member]
MBbls
|
Jun. 30, 2013
2013 Positions [Member]
Derivatives not designated as hedging instruments [Member]
Crude Oil Options [Member]
5 MBbls [Member]
Three-way Collars [Member]
MBbls
|
Jun. 30, 2013
2013 Positions [Member]
Derivatives not designated as hedging instruments [Member]
Crude Oil Options [Member]
17 MBbls [Member]
Put Option [Member]
MBbls
|
Jun. 30, 2013
2013 Positions [Member]
Derivatives not designated as hedging instruments [Member]
Natural gas swaps [Member]
MMBTU
|
Jun. 30, 2013
2014 Positions [Member]
Derivatives not designated as hedging instruments [Member]
Crude Oil Options [Member]
5 MBbls [Member]
Put Option [Member]
MBbls
|
Jun. 30, 2013
2014 Positions [Member]
Derivatives not designated as hedging instruments [Member]
Crude Oil Options [Member]
30 MBbls [Member]
Put Option [Member]
MBbls
|
Jun. 30, 2013
2014 Positions [Member]
Derivatives not designated as hedging instruments [Member]
Crude Oil Options [Member]
75 MBbls [Member]
Put Option [Member]
MBbls
|
Jun. 30, 2013
2014 Positions [Member]
Derivatives not designated as hedging instruments [Member]
Natural gas swaps [Member]
MMBTU
|
Jun. 30, 2013
2015 Positions [Member]
Derivatives not designated as hedging instruments [Member]
Crude Oil Options [Member]
84 MBbls [Member]
Put Option [Member]
MBbls
|
Jun. 30, 2013
Deferred Option Premiums and Accrued Interest [Member]
|
Jun. 30, 2013
Weighted Average [Member]
Crude Oil Options [Member]
|
Jun. 30, 2013
Weighted Average [Member]
2013 Positions [Member]
Derivatives not designated as hedging instruments [Member]
Crude Oil Options [Member]
13 MBbls [Member]
Put Option [Member]
|
Jun. 30, 2013
Weighted Average [Member]
2013 Positions [Member]
Derivatives not designated as hedging instruments [Member]
Crude Oil Options [Member]
17 MBbls [Member]
Put Option [Member]
|
Jun. 30, 2013
Weighted Average [Member]
2014 Positions [Member]
Derivatives not designated as hedging instruments [Member]
Crude Oil Options [Member]
5 MBbls [Member]
Put Option [Member]
|
Jun. 30, 2013
Weighted Average [Member]
2014 Positions [Member]
Derivatives not designated as hedging instruments [Member]
Crude Oil Options [Member]
30 MBbls [Member]
Put Option [Member]
|
Jun. 30, 2013
Weighted Average [Member]
2014 Positions [Member]
Derivatives not designated as hedging instruments [Member]
Crude Oil Options [Member]
75 MBbls [Member]
Put Option [Member]
|
Jun. 30, 2013
Weighted Average [Member]
2015 Positions [Member]
Derivatives not designated as hedging instruments [Member]
Crude Oil Options [Member]
84 MBbls [Member]
Put Option [Member]
|
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Derivative [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||
Derivative Liability | $ 223 | $ 20 | $ 478 | |||||||||||||||||||||||||||||||||||||||||||||
Daily Volumes (Bbls) | 7 | 57 | 40 | [1] | 13 | [2] | 25 | [3] | 5 | [3] | 17 | [2] | 110,000 | [1] | 5 | [2] | 30 | [2] | 75 | [2] | 100,000 | [1] | 84 | [2] | ||||||||||||||||||||||||
Derivative, Average Cap Price | 124.29 | [3],[4] | 126.08 | [3],[4] | ||||||||||||||||||||||||||||||||||||||||||||
Derivative, Average Floor Price | 100 | [2],[4] | 100 | [3],[4] | 90 | [3],[4] | 90 | [2],[4] | 100 | [2],[4] | 95 | [2],[4] | 90 | [2],[4] | 90 | [2],[4] | ||||||||||||||||||||||||||||||||
Derivative, Average Floor Price Limit | 80 | [2],[4] | 80 | [3],[4] | 70 | [3],[4] | 70 | [2],[4] | 80 | [2],[4] | 75 | [2],[4] | 70 | [2],[4] | 70 | [2],[4] | ||||||||||||||||||||||||||||||||
Deferred Premium Price | 6.35 | 6.80 | [2] | 6.25 | [2] | 7.11 | [2] | 6.09 | [2] | 5.74 | [2] | 6.89 | [2] | |||||||||||||||||||||||||||||||||||
Derivative, Underlying Basis | Brent | [1] | Brent | [2] | Brent | [3] | Brent | [3] | Brent | [2] | Henry Hub | [1] | Brent | [2] | Brent | [2] | Brent | [2] | Henry Hub | [1] | Brent | [2] | ||||||||||||||||||||||||||
Derivative Latest Maturity Period | December 2013 | [1] | December 2013 | [1] | December 2014 | [1] | ||||||||||||||||||||||||||||||||||||||||||
Maximum Price Limit per Barrel | 20 | |||||||||||||||||||||||||||||||||||||||||||||||
Derivative, Swap Type, Fixed Price | 109.23 | 4.15 | 109.23 | [1] | 4.27 | [1] | 4.09 | [1] | ||||||||||||||||||||||||||||||||||||||||
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