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Long-term and Short-term Debt (Short-term with Maturities of Year or Less) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Debt Disclosure [Abstract]
Commercial paper	$ 100us-gaap_CommercialPaper	$ 175us-gaap_CommercialPaper
Average daily balance	$ 109	$ 103
Average days outstanding	69 days	55 days

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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