Fair Value Information (Fair Value of the Corporation's Financial Instruments) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011
Monetization Loan	$ 397
Cash equivalents, maturity datesA	90 days or less
Time deposits, maturity date	more than 90 days but less than one year and instruments with original maturities of greater than one year	[1],[2]
Current portion of long-term debt	756		619
Fair Value, Inputs, Level 1 [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
Cash and cash equivalents	1,106	[1]	764	[1]
Time deposits	224	[1]	95	[1]
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Cash and cash equivalents	1,106	[1]	764	[1]
Time deposits	224	[1]	95	[1]
Fair Value, Inputs, Level 2 [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
Short Term Debt	359	[1]	87	[3]
Long-term debt	5,429	[1]	5,648	[4]
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Short Term Debt	359	[3]	87	[3]
Long-term debt	6,527	[4]	6,671	[4]
Fair Value, Inputs, Level 3 [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
Notes receivable	395	[1]	394	[5]
Monetization Loan	397	[1]	397	[5]
Redeemable preferred securities of subsidiaries	506	[1]	506	[5]
Redeemable common securities of subsidiaries	43	[1]	41	[6]
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Notes receivable	392	[1]	373	[5]
Monetization Loan	400	[5]	386	[5]
Redeemable preferred securities of subsidiaries	543	[5]	568	[5]
Redeemable common securities of subsidiaries	$ 43	[6]	$ 41	[6]

[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 are comprised of deposits with original maturities of more than 90 days but less than one year and instruments with original maturities of greater than one year, included in Other current assets or Other assets in the Consolidated Balance Sheet, as appropriate. Time deposits are recorded at cost, which approximates fair value.

[3] Short-term debt is comprised of U.S. commercial paper and other similar short-term debt issued by non-U.S. subsidiaries, all of which are recorded at cost, which approximates fair value.

[4] Long-term debt excludes the monetization loan and includes the current portion ($756 and $619 at December 31, 2012 and 2011, 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.

[5] 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.

[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.