Growth and Value Plan (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	6 Months Ended	10 Months Ended
	Jun. 30, 2012	Jun. 30, 2012	Jun. 30, 2012
Spinoff and Related Activities Disclosure [Abstract]
Spin-off distribution ratio, spinnee shares to be eceived		1
Spinoff distribution ratio, spinnor shares held		3
Growth and value plan, incurred cost	$ 42	$ 75
Growth and value plan, cost incurred to date			$ 85