Segment Information (Details 2) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Corporate and Other total assets [Abstract]
Assets	$ 24,847	$ 22,986	$ 11,439
Cash and other assets [Member]
Corporate and Other total assets [Abstract]
Assets	547	1,391	1,266
Accounts Receivable [Member]
Corporate and Other total assets [Abstract]
Assets	28	28	17
Current deferred tax asset [Member]
Corporate and Other total assets [Abstract]
Assets	0	0	0
Property, plant and equipment [Member]
Corporate and Other total assets [Abstract]
Assets	82	63	10
Other noncurrent assets [Member]
Corporate and Other total assets [Abstract]
Assets	$ 255	$ 278	$ 275