Commitments and Contingencies (Details) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 USD ($) Y	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)	Dec. 31, 2011 Building in United Kingdom USD ($)	Jun. 30, 2003 Building in United Kingdom GBP (£) Y	Dec. 31, 2009 IT Investment USD ($) Y
Capital and Operating Leases:
Rental expense under operating leases	$ 279	$ 262	$ 244
Number of primary capital leases	2
Capital and operating leases with non-cancelable terms, low end of range	1
Primary Capital Leases
Capital lease term (in years)					22	7
Capital lease obligation	92.0			52.0	33.5	50.0
Minimum lease payments under capital leases
2012	19
2013	20
2014	18
2015	5
2016	4
After 2016	34
Total	100
Less: Amounts representing interest	8
Less: Current obligations under capital leases	13
Long-term obligations under capital leases	79	94
Minimum lease payments under operating leases
2012	155
2013	113
2014	87
2015	55
2016	40
After 2016	52
Total	502
Warranties/Guarantees:
Accrued product warranty liabilities	$ 28	$ 27