Income Taxes (Details Textuals) (USD $) In Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2012	Dec. 31, 2010	Dec. 17, 2010
Income Taxes (Textuals) [Abstract]
Gross unrecognized tax benefits	$ 988		$ 988			$ 965
Gross recognized tax benefits	882		882			859
Incremental tax liability asserted by IRS							525
Interest Expense Related To Income Taxes	10	11	17	21
Accrued Interest And Penalties Gross	311		311			285
Potential reduction in unrecognized tax benefits over next 12 months as a result of concluding certain matters					$ 30