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Fair Value Measurements, Other Financial Instruments (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Dec. 31, 2011
Financial assets:        
Cash and temporary cash investments, at carrying amount $ 2,398 $ 1,723 $ 1,295 $ 1,024
Equity investment in CST, at carrying amount 114 0    
Financial liabilities:        
Debt (excluding capital leases), at carrying amount 6,522 7,000    
Fair Value, Inputs, Level 1 [Member]
        
Financial assets:        
Cash and temporary cash investments, at fair value 2,398 1,723    
Equity investment in CST, at fair value 465 0    
Fair Value, Inputs, Level 2 [Member]
        
Financial liabilities:        
Debt (excluding capital leases), at fair value $ 7,736 $ 8,621