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Fair Value Measurements Unobservable Input Reconciliation (Details) (Fair Value, Inputs, Level 3 [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative Asset	$ 0

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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