Provision for Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Income Tax Disclosure [Abstract]
Provision for income taxes on continuing operations	$ 366	$ 335	$ 723	$ 722
Tax expense (benefit) primarily associated with the company's policy of hedging the foreign currency-denominated monetary assets and liabilities	3	16	(25)	50
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