Provision for Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Income Tax Disclosure [Abstract]
Provision for (benefit from) income taxes	$ 449	$ 360	$ 890	$ 618
Tax expense (benefit) primarily associated with the company's policy of hedging the foreign currency-denominated monetary assets and liabilities	$ 59	$ (7)	$ 23	$ (142)