Income Taxes (Details Textuals) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2013	Dec. 31, 2011
Income Taxes (Textuals) [Abstract]
Gross unrecognized tax benefits	$ 990		$ 990			$ 952
Unrecognized tax benefits which would affect our effective tax rate, if recognized	885		885			847
Incremental tax liability asserted by IRS	1,162		1,162
Interest Expense Related To Income Taxes	15	4	26	12
Accrued Interest And Penalties Gross	351		351			313
Potential reduction in unrecognized tax benefits over next 12 months as a result of concluding certain matters					$ 34