Fair Value Information (Fair Value of the Corporation's Financial Instruments) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	$ 120		$ 48
Cash equivalents, maturity date	90 days or less
Time deposits, maturity date	more than 90 days but less than one year
Current portion of long-term debt	619		265
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Cash and cash equivalents	764	[1]	876	[1]
Time deposits	95	[2]	80	[2]
Notes receivable	394	[3]	611	[3]
Short Term Debt	87	[4]	79	[4]
Long-term debt	5,648	[5]	4,988	[5]
Redeemable preferred securities of subsidiaries	506	[3]	1,012	[3]
Redeemable common securities of subsidiaries	41	[6]	35	[6]
Estimate of Fair Value, Fair Value Disclosure [Member]
Cash and cash equivalents	764	[1]	876	[1]
Time deposits	95	[2]	80	[2]
Notes receivable	373	[3]	597	[3]
Short Term Debt	87	[4]	79	[4]
Monetization Loan	386	[3]	397	[3]
Long-term debt	6,671	[5]	5,556	[5]
Redeemable preferred securities of subsidiaries	568	[3]	1,092	[3]
Redeemable common securities of subsidiaries	41	[6]	35	[6]
Monetization Loans [Member]
Monetization Loan	$ 397	[3]	$ 397	[3]

[1] Cash equivalents are comprised of certificates of deposit, time deposits and other interest-bearing investments with original maturity dates of 90 days or less. Cash equivalents are recorded at cost, which approximates fair value.

[2] Time deposits, included in Other current assets on the Consolidated Balance Sheet, are comprised of deposits with original maturities of more than 90 days but less than one year. Time deposits are recorded at cost, which approximates fair value.

[3] The note, monetization loan and redeemable preferred securities of subsidiary are not traded in active markets. Accordingly, their fair values were calculated using a floating rate pricing model that compared the stated spread to the fair value spread to determine the price at which each of the financial instruments should trade. The model used the following inputs to calculate fair values: face value, current LIBOR rate, unobservable fair value credit spread, stated spread, maturity date and interest payment dates. The difference between the carrying amount of the note and its fair value represents an unrealized loss position for which an other-than-temporary impairment has not been recognized in earnings because we have both the intent and ability to hold the note for a period of time sufficient to allow for an anticipated recovery of fair value to the carrying amount of the note.

[4] Short-term debt is recorded at cost, which approximates fair value.

[5] Long-term debt excludes the monetization loan and includes the current portion ($619 million and $265 million as of December 31, 2011 and 2010, respectively) of these debt instruments. Fair values were estimated based on quoted prices for financial instruments for which all significant inputs were observable, either directly or indirectly.

[6] The fair value of the redeemable common securities of subsidiary was based on various inputs, including an independent third-party appraisal, adjusted for current market conditions.