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Derivative Financial Instruments (Schedule of Offsetting Assets) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Derivative Assets [Abstract]
Gross amount recognized	$ 5	$ 2
Gross amount offset in the consolidated balance sheets	0	0
Net amount presented in the consolidated balance sheets	5	2
Gross amount not offset in the consolidated balance sheets	1	2
Net amount	$ 4	$ 0

Fair value of liability associated with derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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- Definition

Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

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- Definition

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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