v2.4.0.6
Cash Flow Information (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cash payments    
Interest $ 157 $ 228
Income taxes 1,199 1,308
Net Purchases of Short-Term Investments    
Short-term investments purchased (23) (497)
Short-term investments sold   589
Net sale (purchases) of short-term investments $ (23) $ 92