Provision for Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Tax Disclosure [Abstract]
(Benefit from) provision for income taxes on continuing operations	$ (35)	$ (135)	$ 687	$ 654
Income (loss) from continuing operations before income taxes	228	(175)	3,367	3,122
Tax expense (benefit) primarily associated with the company's policy of hedging the foreign currency-denominated monetary assets and liabilities	(58)	(71)	(8)	(48)
Tax benefit related to foreign tax law change			(33)
2013 Extension Tax Benefit			(68)
Tax expense related to changes in accruals for prior year tax positions			49
Tax expense on distribution of proceeds from DPC Sale			$ 26