Provision for (benefit from) Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Tax Disclosure [Abstract]
Provision for (benefit from) income taxes on continuing operations	$ 352	$ (35)	$ 1,075	$ 687
Income from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	786	228	4,028	3,367
Tax expense (benefit) primarily associated with the company's policy of hedging the foreign currency-denominated monetary assets and liabilities	257	(58)	232	(8)
Tax expense related to changes in accruals for prior year tax positions				49
Tax benefit related to foreign law change				(33)
2013 extension tax benefit				(68)
Tax expense on distribution of proceeds from DPC Sale				26
Low end of range estimate of reasonably possible change in unrecognized tax benefits	100		100
High end of range estimate of reasonably possible change in unrecognized tax benefits	$ 125		$ 125