Fair Value Measurements (Schedule of Carrying Values and Fair Values of Financial Instruments) (Details) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Fair Value Disclosures [Abstract]
Cost investments, carrying amount	$ 148	$ 139
Cost investments, fair value	0	0
Insurance contracts in nonqualified pension trusts, carrying amount	71	70
Insurance contracts in nonqualified pension trusts, fair value	71	70
Long-term debt, including current installments of long-term debt, carrying amount	2,948	3,064
Long-term debt, including current installments of long-term debt, fair value	$ 2,936	$ 3,087

This item represents the aggregate carrying amount of all cost-method investments as reported on or included in the balance sheet. The original cost of the investments may differ from the aggregate carrying amount disclosed due to various adjustments such as: (i) dividends received in excess of earnings after the date of investment that are considered a return of investment and therefore recorded as reductions to cost of the investment, or (ii) a series of operating losses of an investee or other factors which may indicate that a decrease in value of the investment has occurred which is other than temporary and accordingly such decrease in value has been recognized.

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