Provision for Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Income Tax Disclosure [Abstract]
Provision for income taxes on continuing operations	$ 387	$ 392
Tax expense (benefit) primarily associated with the company's policy of hedging the foreign currency-denominated monetary assets and liabilities	(34)	37
Net tax benefit derived from 2013 tax extension and tax on distribution of proceeds from DPC sale	42
2013 Extension Tax Benefit	68
Tax expense on distribution of proceeds from DPC Sale	$ 26