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Derivative Instruments (Collateral Support Agreements) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Credit risk related contingent features collateral
Maximum potential payout	$ 149	$ 149
Less: Counterparty thresholds
Maximum collateral potentially required to post	$ 149	$ 149

Represents the maximum potential amount of future payments (undiscounted) the seller could be required to make under the credit derivative or each group of similar credit derivatives before reduction for potential recoveries under recourse or collateralization provisions in the credit derivative.

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