Goodwill and Intangible Assets, Net (Schedule of Finite-Lived Intangible Assets, Net) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012	Dec. 31, 2012
Gross Asset Value
Acquisitions (Note 3)	$ 4	[1]
Exchange rate changes	(11)
Gross asset value	612			619
Accumulated Amortization
Amortization	(11)		(13)
Exchange rate changes	10
Accumulated amortization	(537)			(536)
Net book value	75
Weighted average life of intangible assets acquired	20 years
Licenses [Member]
Gross Asset Value
Acquisitions (Note 3)	0
Exchange rate changes	0
Gross asset value	32			32
Accumulated Amortization
Amortization	(1)
Exchange rate changes	0
Accumulated amortization	(17)			(16)
Net book value	15
Customer-Related Intangible Assets [Member]
Gross Asset Value
Acquisitions (Note 3)	0
Exchange rate changes	(11)
Gross asset value	514			525
Accumulated Amortization
Amortization	(9)
Exchange rate changes	10
Accumulated amortization	(479)			(480)
Net book value	35
Developed Technology [Member]
Gross Asset Value
Acquisitions (Note 3)	0
Exchange rate changes	0
Gross asset value	30			30
Accumulated Amortization
Amortization	(1)
Exchange rate changes	0
Accumulated amortization	(18)			(17)
Net book value	12
Covenants Not to Compete and Other [Member]
Gross Asset Value
Acquisitions (Note 3)	4
Exchange rate changes	0
Gross asset value	36			32
Accumulated Amortization
Amortization	0
Exchange rate changes	0
Accumulated amortization	(23)			(23)
Net book value	$ 13

[1] Weighted average amortization period is 20 years.