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Borrowings and Contractual Commitments Contractual Commitments (parenthetical) (Details) (Annual [Member], Purchase Commitment [Member], Lower Limit, USD $) In Millions, unless otherwise specified	Dec. 31, 2012
Annual [Member] \| Purchase Commitment [Member] \| Lower Limit
Long-term Purchase Commitment [Line Items]
Recorded Unconditional Purchase Obligation	$ 5

Amount of the recorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

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