v2.4.0.6
Assets and Liabilities with Recurring Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents $ 1,275 [1] $ 1,415 [1]
Margin deposits 103 [2] 140 [2]
Commodity futures contracts 559 1,043
Commodity forward contracts 69 [3] 111 [3]
Interest rate swaps 5 10
Total assets 2,011 2,719
Margin deposits held by us posted by our counterparties 9 [2],[4] 34 [2],[4]
Commodity futures contracts 497 899
Commodity forward contracts 38 [3] 204 [3]
Interest rate swaps 208 320
Liabilities, Fair Value Disclosure 752 1,457
Fair Value, Inputs, Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 1,275 [1] 1,415 [1]
Margin deposits 103 140
Commodity futures contracts 559 1,043
Commodity forward contracts 0 [3] 0 [3]
Interest rate swaps 0 0
Total assets 1,937 2,598
Margin deposits held by us posted by our counterparties 9 34
Commodity futures contracts 497 899
Commodity forward contracts 0 [3] 0 [3]
Interest rate swaps 0 0
Liabilities, Fair Value Disclosure 506 933
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 47 [3] 74 [3]
Interest rate swaps 5 10
Total assets 52 84
Margin deposits held by us posted by our counterparties 0 0
Commodity futures contracts 0 0
Commodity forward contracts 32 [3] 184 [3]
Interest rate swaps 208 320
Liabilities, Fair Value Disclosure 240 504
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 22 [3] 37 [3]
Interest rate swaps 0 0
Total assets 22 37
Margin deposits held by us posted by our counterparties 0 0
Commodity futures contracts 0 0
Commodity forward contracts 6 [3] 20 [3]
Interest rate swaps 0 0
Liabilities, Fair Value Disclosure $ 6 $ 20
Physical Power [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value Inputs Quantitative Information Power 15,000,000.00  
Minimum [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value Inputs Quantitative Information Power 20.95  
Maximum [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value Inputs Quantitative Information Power 56.78  
[1] As of September 30, 2012 and December 31, 2011, we had cash equivalents of $1,074 million and $1,249 million included in cash and cash equivalents and $201 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 Condensed 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 Condensed Balance Sheets.