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Condensed Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) (USD $)
In Millions, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Statement Of Income And Comprehensive Income [Abstract]          
Foreign currency translation adjustment, tax $ 102 $ (155) $ 39 $ 102 $ (2)
Net actuarial gain (loss), tax     (31) 20 10
Pension liability adjustment, tax (1) (7)      
Prior service credit (cost), tax     (3) 4 (2)
Amortization of net gain, tax     (3) (1) (2)
Cash flow hedge adjustment, tax $ 5   $ (4)   $ (1)