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Derivative Instruments and Hedging Activities Level 4 (Details) - CF Hedges Loss in OCI 3 mos & YTD (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Recognized in OCI on Derivative - Interest swap - 2010	$ 0	$ (1)
Amount of Loss Reclassified from Accumulated OCI into Income - Interest swap - 2010	$ (1)	$ (1)

- Definition

The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References+ Details

- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ References+ Details