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Short-Term Debt And Liquidity Short-Term Debt And Liquidity (Commercial Paper) (Details) (Commercial Paper, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Commercial Paper
Line of Credit Facility [Line Items]
Average Daily Commercial Paper Borrowings Outstanding	$ 54	$ 49
Commercial paper outstanding	368
Weighted average interest rate	0.56%	0.92%
Peak short-term borrowings	$ 368	$ 229
Peak short-term borrowings interest rate	0.85%	1.25%

Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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