Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012
Minimum rental payments under operating leases
2012	$ 54	[1]
2013	42	[1]
2014	29	[1]
2015	22	[1]
2016	17	[1]
Thereafter	$ 36	[1]

[1] The disclosed rent expense for the year-ended December 31, 2011, as adjusted, is $64 million