XML 111 R57.htm IDEA: XBRL DOCUMENT  v2.3.0.11
Derivative Instruments And Hedging Activities (Schedule Of Cash Collateral Offset Against Derivative Positions) (Details) (USD $)
In Millions
Jun. 30, 2011
Dec. 31, 2010
Derivative Instruments And Hedging Activities    
Cash collateral pledged to counterparties with the right to reclaim $ 78 [1] $ 122 [1]
[1] Includes cash deposits on commodity brokerage accounts