Income Taxes Level 4 (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Valuation Allowance [Line Items]
Income tax benefit	$ 373	$ 5	$ 371	$ 2
Interest, Deferred Tax Asset	23		23
Deferred Tax, State NOL	$ 40		$ 40