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Accounting Policies Schedule of Accounting Policies (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Jun. 30, 2014
Jun. 30, 2013
Feb. 13, 2013
Venezuela foreign currency devaluation 88.00%       32.00%
Exchange rate net charges, total $ 42 $ 51      
Exchange rate net charges on other expense, net 54 34      
Exchange rate net charges on income taxes 12 17      
Charge for Venezuelan non-monetary assets to their net realizable value $ 115.7   $ 115.7 $ 0