Fair Value of Financial Investments and Liabilities (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Income from financial investments net included in other net within other income expense net
Total income from financial investments	$ 16	$ 17
Private Equity Funds [Member]
Income from financial investments net included in other net within other income expense net
Realized gains	16	3
TriMas Corporation Common Stock [Member]
Income from financial investments net included in other net within other income expense net
Realized gains		$ 14