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Investments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Categories of Investments, Marketable Securities, Trading Securities
Investments held in our rabbi trusts	$ 90	$ 90
Categories of Investments, Cost-method Investments
Investments held in our rabbi trusts	$ 15	$ 17

The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations.

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