Fair Value of Financial Investments (Details 4) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Income from financial investments net included in other net within other income expense net
Total income from financial investments	$ 2	$ 33	$ 18	$ 50
Private Equity Funds [Member]
Income from financial investments net included in other net within other income expense net
Realized gains	2	6	18	9
Impairment charges	(2)		(2)
TriMas Corporation Common Stock [Member]
Income from financial investments net included in other net within other income expense net
Realized gains		$ 27		$ 41