Income Taxes (Net Operating Loss Carryforwards) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards	$ 1,637	$ 30
Tax Credit Carryforward, Amount	103	112
State and Local Jurisdiction [Member]
Operating Loss Carryforwards	2,649	1,460
Operating Loss Carryforwards, Valuation allowance	46	14
Tax Credit Carryforward, Amount	$ 3	$ 3