Income Taxes (Details Textuals) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Income Tax Examination [Line Items]
Deferred Tax Assets (Liabilities), Net		$ 1,379	$ 1,198
Deferred Tax Liabilities, Undistributed Foreign Earnings		10,346	9,193
Gross unrecognized tax benefits		952	965	1,038	1,107
Gross recognized tax benefits		847	859
Income Taxes (Textuals) [Abstract]
Incremental tax liability asserted by IRS		1,162
Accrued Interest And Penalties Gross		303	285
Gross interest and penalties recognized in period		48
Reduction in interest and penalties during period		30
Income Tax Examination, Penalties and Interest Expense		18	14	31
Potential reduction in unrecognized tax benefits over next 12 months as a result of concluding certain matters	26
Deferred Tax Liabilities		2,373	2,308
Deferred tax assets, net of valuation allowance		$ 994	$ 1,110