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Financial Instruments: (Details 4) (USD $)
6 Months Ended 12 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Derivative Instruments, Gain (Loss)    
Fair value of derivative liabilities $ 2,828,000,000 $ 2,415,000,000
Derivative instruments in fair value hedging relationships | Interest rate swaps
   
Derivative Instruments, Gain (Loss)    
Notional amount 5,900,000,000 5,900,000,000
Average remaining maturity 5 years 5 years 6 months
Derivative instruments in cash flow hedging relationships | Foreign exchange forward contracts
   
Derivative Instruments, Gain (Loss)    
Notional amount 11,400,000,000 10,900,000,000
Average remaining maturity 8 months 12 days 8 months 12 days
Net gains (losses) in other comprehensive income in connection with cash flow hedges 69,000,000 88,000,000
Gains (losses) expected to be reclassified to net income within the next 12 months 199,000,000 191,000,000
Maximum length of time hedged 4 years  
Derivative instruments in cash flow hedging relationships | Interest rate swaps
   
Derivative Instruments, Gain (Loss)    
Net gains (losses) in other comprehensive income/(loss), cash flow hedges of borrowings (1,000,000) (5,000,000)
Gains (losses) expected to be reclassified to net income within the next 12 months (2,000,000) (6,000,000)
Derivative instruments in net investment hedging relationships
   
Derivative Instruments, Gain (Loss)    
Notional amount 6,700,000,000 5,000,000,000
Average remaining maturity 2 months 12 days 4 months 24 days
Derivative instruments designated as hedging instruments
   
Derivative Instruments, Gain (Loss)    
Fair value of derivative liabilities 408,000,000 428,000,000
Derivative instruments not designated as hedging instruments
   
Derivative Instruments, Gain (Loss)    
Fair value of derivative liabilities 104,000,000 103,000,000
Derivative instruments not designated as hedging instruments | Foreign exchange forward and swap contracts
   
Derivative Instruments, Gain (Loss)    
Notional amount 14,100,000,000 13,600,000,000
Maximum length of time hedged 1 year  
Derivative instruments not designated as hedging instruments | Equity contracts
   
Derivative Instruments, Gain (Loss)    
Notional amount $ 1,100,000,000 $ 1,000,000,000
Derivative instruments not designated as hedging instruments | Credit default swaps
   
Derivative Instruments, Gain (Loss)    
Maximum length of time hedged 1 year