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Fair Value Measurements Footnote (details) - Financial Instruments (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Financial Instruments    
Short-term securities $ 4,034 $ 3,882
Fair Value [Member]
   
Financial Instruments    
Short-term securities 4,034 3,882
Debt 7,298 7,123
Commercial paper 100 100
Fair Value [Member] | Level 1 [Member]
   
Financial Instruments    
Short-term securities 1,507 1,608
Fair Value [Member] | Level 2 [Member]
   
Financial Instruments    
Short-term securities 2,470 2,215
Debt 7,298 7,123
Commercial paper 100 100
Fair Value [Member] | Level 3 [Member]
   
Financial Instruments    
Short-term securities 57 59
Carrying Value [Member]
   
Financial Instruments    
Short-term securities 4,034 3,882
Debt 6,247 6,246
Commercial paper $ 100 $ 100