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Debt (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Dec. 31, 2009 5.15% Notes Due April 1, 2014 [Member]
Debt Disclosure [Abstract]
Outstanding commercial paper	$ 446,000,000	$ 408,000,000
Debt Instrument [Line Items]
Face value of notes			800,000,000
Interest rate, stated percentage			5.15%
Fair value	4,728,000,000	5,105,000,000
Carrying value	$ 4,613,000,000	$ 4,595,000,000

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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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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