Provision for Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Tax Disclosure [Abstract]
Provision for income taxes on continuing operations	$ 335	$ 397	$ 722	$ 789
Tax expense (benefit) primarily associated with the company's policy of hedging the foreign currency-denominated monetary assets and liabilities	16	60	50	23
Tax expense related to changes in accruals for prior year tax positions	49
Tax benefit related to foreign tax law change	(33)
2013 Extension Tax Benefit			(68)
Tax expense on distribution of proceeds from DPC Sale			$ 26