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Risk Management, Derivative Instruments And Hedging Activities (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Risk Management, Derivative Instruments And Hedging Activities [Abstract]
Pre-tax deferred net losses on derivative instruments in AOCI	$ 115
Gains or losses excluded from the assessment of hedge effectiveness	0	0
Gain expected to be recognized in earnings during the next 12 months	$ 10

The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

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