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Financial Instruments (Schedule Of Carrying Amounts And Estimated Fair Values Of Financial Instruments Not Recorded At Fair Value) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Carrying Amount [Member]
Financial Instrument [Line Items]
Short-term debt (excluding capital leases)	$ 485	$ 485
Long-term debt (excluding capital leases)	1,508	1,505
Estimated Fair Value [Member]
Financial Instrument [Line Items]
Short-term debt (excluding capital leases)	492	490
Long-term debt (excluding capital leases)	$ 1,719	$ 1,619

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. 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, and after deducting unamortized discount or premiums, if any.

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- Definition

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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