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Hedging Activities (Narrative) (Details) (USD $)
In Millions
1 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended
Feb. 28, 2010
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Feb. 29, 2000
Net Investment Hedging [Member]
Debt Instrument [Line Items]            
Notes issued as a hedge           $ 500
Maximum duration to hedge foreign currency risk, months       18    
Maximum Length of Time Hedged in Cash Flow Hedge       18    
Repayment of balance of debt 48          
Foreign currency translation adjustment 140 226 [1] (197) [1] 365 [1] (219) [1]  
Net losses expected to be reclassified into earnings within the next 12 months       $ (20)    
[1] Other comprehensive income items for the three months ended June 30, 2011 and 2010 include net tax effects of $(16) million and $(10) million, respectively, and for the six months ended June 30, 2011 and 2010 net tax effects of $(30) million and $(15) million, respectively.