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Risk Management and Trading Activities (Tables)
9 Months Ended
Sep. 30, 2011
Derivative [Line Items] 
Net pre-tax gains on derivative contracts used for corporate risk management not designated as hedges
                                 
    Three Months     Nine Months  
    Ended September 30,     Ended September 30,  
    2011     2010     2011     2010  
            (Millions of dollars)          
Commodity
  $     $     $ 1     $ (7 )
Foreign exchange
    (25 )     48       (12 )     (4 )
 
                       
Total
  $ (25 )   $ 48     $ (11 )   $ (11 )
 
                       
Pre-tax gains (losses) from trading activities
                                 
    Three Months     Nine Months  
    Ended September 30,     Ended September 30,  
    2011     2010     2011     2010  
            (Millions of dollars)          
Commodity
  $ (5 )   $ (118 )   $ 45     $ 26  
Foreign exchange
    7       2       (1 )     8  
Other
    (52 )     12       (42 )     (5 )
 
                       
Total
  $ (50 )   $ (104 )   $ 2     $ 29  
 
                       
Fair Value of the Corporation's financial assets and liabilities based on hierarchy
                                                        
                            Collateral        
                            and        
                            counterparty        
    Level 1     Level 2     Level 3     netting     Balance  
            (Millions of dollars)          
September 30, 2011
                                       
Assets
                                       
Derivative contracts
                                       
Commodity
  $ 283     $ 1,288     $ 320     $ (305 )   $ 1,586  
Foreign exchange
          1                   1  
Interest rate and other
    2       71       1       (1 )     73  
Collateral and counterparty netting
    (58 )     (220 )     (20 )     (133 )     (431 )
 
                             
Total derivative contracts
    227       1,140       301       (439 )     1,229  
Other assets measured at fair value on a recurring basis
    10       90             (1 )     99  
 
                             
Total assets
  $ 237     $ 1,230     $ 301     $ (440 )   $ 1,328  
 
                             
 
                                       
Liabilities
                                       
Derivative contracts
                                       
Commodity
  $ (490 )   $ (1,645 )   $ (557 )   $ 305     $ (2,387 )
Foreign exchange
          (36 )                 (36 )
Other
          (61 )     (7 )     1       (67 )
Collateral and counterparty netting
    58       220       20       85       383  
 
                             
Total derivative contracts
    (432 )     (1,522 )     (544 )     391       (2,107 )
Other liabilities measured at fair value on a recurring basis
          (58 )     (1 )     1       (58 )
 
                             
Total liabilities
  $ (432 )   $ (1,580 )   $ (545 )   $ 392     $ (2,165 )
 
                             
 
December 31, 2010
                                       
Assets
                                       
Derivative contracts
                                       
Commodity
  $ 65     $ 1,308     $ 883     $ (304 )   $ 1,952  
Foreign exchange
          1                   1  
Interest rate and other
          17                   17  
Collateral and counterparty netting
    (1 )     (274 )     (19 )     (213 )     (507 )
 
                             
Total derivative contracts
    64       1,052       864       (517 )     1,463  
Other assets measured at fair value on a recurring basis
    20       49       3             72  
 
                             
Total assets
  $ 84     $ 1,101     $ 867     $ (517 )   $ 1,535  
 
                             
 
                                       
Liabilities
                                       
Derivative contracts
                                       
Commodity
  $ (324 )   $ (2,519 )   $ (474 )   $ 304     $ (3,013 )
Foreign exchange
          (12 )                 (12 )
Other
          (10 )                 (10 )
Collateral and counterparty netting
    1       274       19       34       328  
 
                             
Total derivative contracts
    (323 )     (2,267 )     (455 )     338       (2,707 )
Other liabilities measured at fair value on a recurring basis
                             
 
                             
Total liabilities
  $ (323 )   $ (2,267 )   $ (455 )   $ 338     $ (2,707 )
 
                             
Changes in financial assets and liabilities at fair value based on level 3 inputs
                                 
    Three Months     Nine Months  
    Ended September 30,     Ended September 30,  
    2011     2010     2011     2010  
            (Millions of dollars)          
Balance at beginning of period
  $ 372     $ 41     $ 412     $ 84  
Unrealized gains (losses)
                               
Included in earnings
    (85 )     105       19       163  
Included in other comprehensive income
    13       (18 )     30       62  
Purchases
    415       347       1,932       782  
Sales
    (536 )     (397 )     (2,131 )     (745 )
Settlements
    (162 )     (1 )     (194 )     (46 )
Transfers into Level 3
    (222 )     215       (211 )     57  
Transfers out of Level 3
    (39 )     12       (101 )     (53 )
 
                       
Balance at end of period
  $ (244 )   $ 304     $ (244 )   $ 304  
 
                       
Net transfers into and out of each level of the fair value hierarchy
                                 
    Three Months     Nine Months  
    Ended September 30,     Ended September 30,  
    2011     2010     2011     2010  
            (Millions of dollars)          
Transfers into Level 1
  $ (4 )   $ 95     $ (12 )   $ 123  
Transfers out of Level 1
    39       89       318       23  
 
                       
 
  $ 35     $ 184     $ 306     $ 146  
 
                       
 
                               
Transfers into Level 2
  $ 28     $ (8 )   $ 34     $ 121  
Transfers out of Level 2
    198       (403 )     (28 )     (271 )
 
                       
 
  $ 226     $ (411 )   $ 6     $ (150 )
 
                       
 
                               
Transfers into Level 3
  $ (222 )   $ 215     $ (211 )   $ 57  
Transfers out of Level 3
    (39 )     12       (101 )     (53 )
 
                       
 
  $ (261 )   $ 227     $ (312 )   $ 4  
 
                       
Gross and net fair values of the Corporation's risk management and trading derivative instruments
                 
    Accounts     Accounts  
    Receivable     Payable  
    (Millions of dollars)  
September 30, 2011
               
Derivative contracts designated as hedging instruments
               
Commodity
  $ 97     $ (281 )
Other
    56       (3 )
 
           
Total derivative contracts designated as hedging instruments
    153       (284 )
 
           
 
               
Derivative contracts not designated as hedging instruments (*)
               
Commodity
    12,040       (12,657 )
Foreign exchange
    6       (41 )
Other
    60       (107 )
 
           
Total derivative contracts not designated as hedging instruments
    12,106       (12,805 )
 
           
 
               
Gross fair value of derivative contracts
    12,259       (13,089 )
Master netting arrangements
    (10,897 )     10,897  
Cash collateral (received) posted
    (133 )     85  
 
           
Net fair value of derivative contracts
  $ 1,229     $ (2,107 )
 
           
 
               
December 31, 2010
               
Derivative contracts designated as hedging instruments
               
Commodity
  $ 225     $ (483 )
Other
    10       (2 )
 
           
Total derivative contracts designated as hedging instruments
    235       (485 )
 
           
 
               
Derivative contracts not designated as hedging instruments (*)
               
Commodity
    11,581       (12,383 )
Foreign exchange
    7       (19 )
Other
    31       (32 )
 
           
Total derivative contracts not designated as hedging instruments
    11,619       (12,434 )
 
           
 
               
Gross fair value of derivative contracts
    11,854       (12,919 )
Master netting arrangements
    (10,178 )     10,178  
Cash collateral (received) posted
    (213 )     34  
 
           
Net fair value of derivative contracts
  $ 1,463     $ (2,707 )
 
           
 
(*)   Includes trading derivatives and derivatives used for risk management.
Energy Marketing [Member]
 
Derivative [Line Items] 
Gross volume of the Corporation's derivative instruments outstanding
                 
    September 30,     December 31,  
    2011     2010  
Crude oil and refined petroleum products (millions of barrels)
    27       30  
Natural gas (millions of mcf)
    2,532       2,210  
Electricity (millions of megawatt hours)
    242       301  
Trading [Member]
 
Derivative [Line Items] 
Gross volume of the Corporation's derivative instruments outstanding
                 
    September 30,     December 31,  
    2011     2010  
Commodity
               
Crude oil and refined petroleum products (millions of barrels)
    2,966       3,328  
Natural gas (millions of mcf)
    4,910       4,699  
Electricity (millions of megawatt hours)
    268       79  
Foreign exchange (millions of U.S. Dollars)
  $ 621     $ 506  
Other
               
Interest rate (millions of U.S. Dollars)
  $ 127     $ 205  
Equity securities (millions of shares)
    34       35  
Corporate Risk Management [Member]
 
Derivative [Line Items] 
Gross volume of the Corporation's derivative instruments outstanding
                 
    September 30,     December 31,  
    2011     2010  
Commodity, primarily crude oil (millions of barrels)
    22       35  
Foreign exchange (millions of U.S. Dollars)
  $ 940     $ 1,025  
Interest rate swaps (millions of U.S. Dollars)
  $ 895     $ 310