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Derivatives and Risk Management Activities (Details 7) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Level 3
Sep. 30, 2012
Level 3
Jun. 30, 2012
Level 3
Sep. 30, 2013
Level 3
Sep. 30, 2012
Level 3
Sep. 30, 2013
Recurring Fair Value Measures
Level 1
Dec. 31, 2012
Recurring Fair Value Measures
Level 1
Sep. 30, 2013
Recurring Fair Value Measures
Level 1
Commodity
Dec. 31, 2012
Recurring Fair Value Measures
Level 1
Commodity
Sep. 30, 2013
Recurring Fair Value Measures
Level 2
Dec. 31, 2012
Recurring Fair Value Measures
Level 2
Sep. 30, 2013
Recurring Fair Value Measures
Level 2
Commodity
Dec. 31, 2012
Recurring Fair Value Measures
Level 2
Commodity
Sep. 30, 2013
Recurring Fair Value Measures
Level 2
Interest Rate Contracts
Dec. 31, 2012
Recurring Fair Value Measures
Level 2
Interest Rate Contracts
Sep. 30, 2013
Recurring Fair Value Measures
Level 2
Foreign currency derivatives
Sep. 30, 2013
Recurring Fair Value Measures
Level 3
Dec. 31, 2012
Recurring Fair Value Measures
Level 3
Sep. 30, 2013
Recurring Fair Value Measures
Level 3
Commodity
Dec. 31, 2012
Recurring Fair Value Measures
Level 3
Commodity
Sep. 30, 2013
Recurring Fair Value Measures
Total
Dec. 31, 2012
Recurring Fair Value Measures
Total
Sep. 30, 2013
Recurring Fair Value Measures
Total
Commodity
Dec. 31, 2012
Recurring Fair Value Measures
Total
Commodity
Sep. 30, 2013
Recurring Fair Value Measures
Total
Interest Rate Contracts
Dec. 31, 2012
Recurring Fair Value Measures
Total
Interest Rate Contracts
Sep. 30, 2013
Recurring Fair Value Measures
Total
Foreign currency derivatives
Recurring Fair Value Measures                                                      
Net asset/(liability) at fair value           $ (11) $ 1 $ (11) $ 1 $ (5) $ (3) $ (22) $ 35 $ 16 $ (38) $ 1 $ (1) $ 4 $ (1) $ 4 $ (17) $ 2 $ (34) $ 40 $ 16 $ (38) $ 1
Roll forward of Level 3 Net Asset                                                      
Beginning Balance 4 36   4 12                                            
Total gains/(losses) for the period:                                                      
Included in earnings (4) (9)   (1) (1)                                            
Included in other comprehensive income         3                                            
Settlements (1) (4)   (3) (18)                                            
Derivatives entered into during the period   1   (1) 23                                            
Transfers out of Level 3 (liability)     5                                                
Transfers out of Level 3 (asset)   (14)     (9)                                            
Ending Balance (1) 10 36 (1) 10                                            
Transfers out of Level 3 (asset)   14                                                  
Change in unrealized gains/(losses) included in earnings relating to level 3 derivatives still held at the end of the periods $ (4) $ (8)   $ (1) $ 25