Income Taxes (Details Textuals) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2014	Dec. 31, 2012
Income Taxes (Textuals) [Abstract]
Gross unrecognized tax benefits	$ 1,060		$ 1,060			$ 1,052
Unrecognized tax benefits which would affect our effective tax rate, if recognized	924		924			902
Incremental tax liability asserted by IRS	1,162		1,162
Interest Expense Related To Income Taxes	11	9	20	11
Accrued Interest And Penalties Gross	394		394			364
Potential reduction in unrecognized tax benefits over next 12 months as a result of concluding certain matters					$ 34