Fair Value Measurements (Details 1) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill	9,794	9,794
Indefinite-Lived Intangible Assets (Excluding Goodwill)	4,373	4,375
Goodwill [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements, Valuation Techniques	Market approach. Prices and other relevant information generated by market transactions involving identical or comparable assets or liabilities; and .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).	Market approach. Prices and other relevant information generated by market transactions involving identical or comparable assets or liabilities; and .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).
Indefinite-lived intangible assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements, Valuation Techniques	Market approach. Prices and other relevant information generated by market transactions involving identical or comparable assets or liabilities; 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).	Market approach. Prices and other relevant information generated by market transactions involving identical or comparable assets or liabilities; 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).