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Financial Instruments (Unaudited) Other Financial Instruments (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Dec. 31, 2011
Cash and Cash Equivalents [Line Items]        
Credit Derivative, Maximum Exposure, Undiscounted $ 43      
Cash and cash equivalents 3,294 3,705 4,508 4,822
Time Deposits [Member]
       
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents $ 37 $ 514