Supplemental Balance Sheet Information (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Other current assets
Other current assets	$ 1,378	$ 1,279
Investments
Total investments	120	122
Other assets
Total other assets	1,063	980
Other current liabilities
Dividends payable		567
Total other current liabilities	2,436	2,891
Other liabilities
Total other liabilities	$ 1,963	$ 1,984