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Derivative Financial Instruments (Schedule of Offsetting Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Derivative Liabilities [Abstract]
Gross amount recognized	$ 23	$ 32
Gross amount offset in the consolidated balance sheets	1	1
Net amount presented in the consolidated balance sheets	22	31
Gross amount not offset in the consolidated balance sheets	1	2
Net amount	$ 21	$ 29

Fair value of derivative liability, 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 liabilities 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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