v2.4.0.8
Use of Collateral (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Use of Collateral [Abstract]    
Margin deposits $ 302 [1] $ 196 [1]
Natural gas and power prepayments 23 35
Total margin deposits and natural gas and power prepayments with our counterparties 325 [2] 231 [2]
Letters of credit issued 505 484
First priority liens under power and natural gas agreements 18 14
First priority liens under interest rate swap agreements 148 206
Total letters of credit and first priority liens with our counterparties 671 704
Margin deposits held by us posted by our counterparties 22 [1],[3] 11 [1],[3]
Letters of credit posted with us by our counterparties 87 1
Total margin deposits and letters of credit posted with us by our counterparties 109 12
Use of Collateral (Textuals) [Abstract]    
Margin And Prepayment Amounts Included In Other Assets 18 20
Margin And Prepayment Amounts Included In Margin Deposits And Other Prepaid Expenses $ 307 $ 211
[1] 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, and we do not offset amounts recognized for the right to reclaim, or the obligation to return, cash collateral with corresponding derivative instrument fair values. See Note 5 for further discussion of our derivative instruments subject to master netting arrangements.
[2] At September 30, 2013 and December 31, 2012, $307 million and $211 million, respectively, were included in margin deposits and other prepaid expense and $18 million and $20 million, respectively, were included in other assets on our Consolidated Condensed Balance Sheets.
[3] Included in other current liabilities on our Consolidated Condensed Balance Sheets.