Fair Value Measurements and Financial Instruments (Details 1) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Derivative and Financial Instruments, Fair Value [Line Items]
Total assets derivatives	$ 35	$ 65
Total liabilities derivatives	12	11
Financial Instruments, Owned, at Fair Value [Abstract]
Total other financial instruments	822	734
Designated derivative instruments
Derivative Assets	35	65
Derivative Liabilities	11	10
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	0	0
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	1	1
Other Current Assets [Member]
Derivative and Financial Instruments, Fair Value [Line Items]
Marketable Securities	146	116
Interest Rate Swap Contracts [Member] | Other Current Assets [Member]
Designated derivative instruments
Derivative Assets	1	3
Interest Rate Swap Contracts [Member] | Other Assets [Member]
Designated derivative instruments
Derivative Assets	22	41
Interest Rate Swap Contracts [Member] | Other Accruals [Member]
Designated derivative instruments
Derivative Liabilities	0	0
Interest Rate Swap Contracts [Member] | Other Liabilities [Member]
Designated derivative instruments
Derivative Liabilities	0	0
Foreign Currency Contracts [Member] | Other Current Assets [Member]
Designated derivative instruments
Derivative Assets	9	7
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	0	0
Foreign Currency Contracts [Member] | Other Assets [Member]
Designated derivative instruments
Derivative Assets	3	13
Foreign Currency Contracts [Member] | Other Accruals [Member]
Designated derivative instruments
Derivative Liabilities	10	10
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	1	1
Foreign Currency Contracts [Member] | Other Liabilities [Member]
Designated derivative instruments
Derivative Liabilities	1	0
Commodity Contracts [Member] | Other Current Assets [Member]
Designated derivative instruments
Derivative Assets	0	1
Commodity Contracts [Member] | Other Accruals [Member]
Designated derivative instruments
Derivative Liabilities	0	0
Available for Sale Securities | Other Assets [Member]
Financial Instruments, Owned, at Fair Value [Abstract]
Available-for-sale Securities, Fair Value Disclosure	$ 676	$ 618