Fair Value Measurements (Details 4) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill, Fair Value Disclosure	$ 9,794		$ 9,794
Fair Value, Goodwill, Valuation Techniques	(a)(b)(c)	[1],[2],[3]
Indefinite-lived Intangible Assets (Excluding Goodwill), Fair Value Disclosure	$ 4,375		$ 4,303
Fair Value, Indefinite-lived Intangible Assets (Excluding Goodwill), Valuation Techniques	(a)(c)	[1],[2],[3]

[1] (a)Market approach. Prices and other relevant information generated by market transactions involving identical or comparable assets or liabilities

[2] (c)Income approach. Techniques to convert future amounts to a single present amount based on market expectations (including present value techniques, option-pricing and excess earnings models)

[3] (b)Cost approach. Amount that would be required to replace the service capacity of an asset (replacement cost)