v2.4.0.6
Assets and Liabilities with Recurring Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents $ 1,502 [1] $ 1,415 [1]
Margin deposits 196 [2] 140 [2]
Commodity futures contracts 385 1,043
Commodity forward contracts 48 [3] 111 [3]
Interest rate swaps 4 10
Total assets 2,135 2,719
Margin deposits held by us posted by our counterparties 11 [2],[4] 34 [2],[4]
Commodity futures contracts 424 899
Commodity forward contracts 26 [3] 204 [3]
Interest rate swaps 200 320
Total liabilities 661 1,457
Fair Value, Inputs, Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 1,502 [1] 1,415 [1]
Margin deposits 196 140
Commodity futures contracts 385 1,043
Commodity forward contracts 0 [3] 0 [3]
Interest rate swaps 0 0
Total assets 2,083 2,598
Margin deposits held by us posted by our counterparties 11 34
Commodity futures contracts 424 899
Commodity forward contracts 0 [3] 0 [3]
Interest rate swaps 0 0
Total liabilities 435 933
Fair Value, Inputs, Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 0 [1] 0 [1]
Margin deposits 0 0
Commodity futures contracts 0 0
Commodity forward contracts 24 [3] 74 [3]
Interest rate swaps 4 10
Total assets 28 84
Margin deposits held by us posted by our counterparties 0 0
Commodity futures contracts 0 0
Commodity forward contracts 18 [3] 184 [3]
Interest rate swaps 200 320
Total liabilities 218 504
Fair Value, Inputs, Level 3 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 0 [1] 0 [1]
Margin deposits 0 0
Commodity futures contracts 0 0
Commodity forward contracts 24 [3] 37 [3]
Interest rate swaps 0 0
Total assets 24 37
Margin deposits held by us posted by our counterparties 0 0
Commodity futures contracts 0 0
Commodity forward contracts 8 [3] 20 [3]
Interest rate swaps 0 0
Total liabilities $ 8 $ 20
[1] As of December 31, 2012 and 2011, we had cash equivalents of $1,274 million and $1,249 million included in cash and cash equivalents and $228 million and $166 million included in restricted cash, respectively.
[2] Balances are subject to master netting arrangements and presented on a gross basis on our Consolidated Balance Sheets. We do not offset fair value amounts recognized for derivative instruments executed with the same counterparty under a master netting arrangement for financial statement presentation.
[3] Includes OTC swaps and options.
[4] Included in other current liabilities on our Consolidated Balance Sheets.