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Fair Value Measurements and Derivatives - Fair Value of Financial Instrument (Details) (Fair Value, Inputs, Level 2, USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Fair Value of Financial Instruments [Line Items]
Carrying Value	$ 857	$ 859
Fair Value	900	912
Market Approach Valuation Technique \| Senior Notes
Fair Value of Financial Instruments [Line Items]
Carrying Value	750	750
Fair Value	794	805
Income Approach Valuation Technique \| Debt, Other
Fair Value of Financial Instruments [Line Items]
Carrying Value	107	109
Fair Value	$ 106	$ 107

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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