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Derivatives and Risk Management Activities (Details 7) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Level 3
Jun. 30, 2013
Level 3
Jun. 30, 2014
Level 3
Jun. 30, 2013
Level 3
Jun. 30, 2014
Recurring Fair Value Measures
Level 1
Dec. 31, 2013
Recurring Fair Value Measures
Level 1
Jun. 30, 2014
Recurring Fair Value Measures
Level 1
Commodity Derivatives
Dec. 31, 2013
Recurring Fair Value Measures
Level 1
Commodity Derivatives
Jun. 30, 2014
Recurring Fair Value Measures
Level 2
Dec. 31, 2013
Recurring Fair Value Measures
Level 2
Jun. 30, 2014
Recurring Fair Value Measures
Level 2
Commodity Derivatives
Dec. 31, 2013
Recurring Fair Value Measures
Level 2
Commodity Derivatives
Jun. 30, 2014
Recurring Fair Value Measures
Level 2
Interest Rate Derivatives
Dec. 31, 2013
Recurring Fair Value Measures
Level 2
Interest Rate Derivatives
Jun. 30, 2014
Recurring Fair Value Measures
Level 2
Foreign Currency Derivatives
Dec. 31, 2013
Recurring Fair Value Measures
Level 2
Foreign Currency Derivatives
Jun. 30, 2014
Recurring Fair Value Measures
Level 3
Dec. 31, 2013
Recurring Fair Value Measures
Level 3
Jun. 30, 2014
Recurring Fair Value Measures
Level 3
Commodity Derivatives
Dec. 31, 2013
Recurring Fair Value Measures
Level 3
Commodity Derivatives
Jun. 30, 2014
Recurring Fair Value Measures
Total
Dec. 31, 2013
Recurring Fair Value Measures
Total
Jun. 30, 2014
Recurring Fair Value Measures
Total
Commodity Derivatives
Dec. 31, 2013
Recurring Fair Value Measures
Total
Commodity Derivatives
Jun. 30, 2014
Recurring Fair Value Measures
Total
Interest Rate Derivatives
Dec. 31, 2013
Recurring Fair Value Measures
Total
Interest Rate Derivatives
Jun. 30, 2014
Recurring Fair Value Measures
Total
Foreign Currency Derivatives
Dec. 31, 2013
Recurring Fair Value Measures
Total
Foreign Currency Derivatives
Recurring Fair Value Measures                                                        
Net derivative asset/(liability)         $ 28 $ 16 $ 28 $ 16 $ (10) $ (37) $ (9) $ (59) $ (7) $ 26 $ 6 $ (4) $ 1 $ (3) $ 1 $ (3) $ 19 $ (24) $ 20 $ (46) $ (7) $ 26 $ 6 $ (4)
Roll forward of Level 3 Net Asset                                                        
Beginning Balance 1 1 (3) 4                                                
Unrealized gains/(losses):                                                        
Included in earnings   1   1                                                
Settlements     3 (3)                                                
Derivatives entered into during the period   2 1 2                                                
Ending Balance 1 4 1 4                                                
Change in unrealized gains/(losses) included in earnings relating to level 3 derivatives still held at the end of the periods $ 1 $ 3 $ 1 $ 3