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Financial Instruments: (Details 4) (USD $)
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9 Months Ended | 12 Months Ended |
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Sep. 30, 2012
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Dec. 31, 2011
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| Derivative Instruments, Gain (Loss) | ||
| Fair value of derivative liabilities | $ 2,771,000,000 | $ 2,415,000,000 |
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Derivative instruments in fair value hedging relationships | Interest rate swaps
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| Derivative Instruments, Gain (Loss) | ||
| Notional amount | 5,900,000,000 | 5,900,000,000 |
| Average remaining maturity | 4 years 8 months 12 days | 5 years 6 months |
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Derivative instruments in cash flow hedging relationships | Foreign exchange forward contracts
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| Derivative Instruments, Gain (Loss) | ||
| Notional amount | 11,200,000,000 | 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 | (99,000,000) | 88,000,000 |
| Gains (losses) expected to be reclassified to net income within the next 12 months | (64,000,000) | 191,000,000 |
| Maximum length of time hedged | 4 years | |
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Derivative instruments in cash flow hedging relationships | Interest rate swaps
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| 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 | (1,000,000) | (6,000,000) |
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Derivative instruments in net investment hedging relationships
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| Derivative Instruments, Gain (Loss) | ||
| Notional amount | 5,100,000,000 | 5,000,000,000 |
| Average remaining maturity | 2 months 12 days | 4 months 24 days |
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Derivative instruments designated as hedging instruments
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| Derivative Instruments, Gain (Loss) | ||
| Fair value of derivative liabilities | 340,000,000 | 428,000,000 |
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Derivative instruments not designated as hedging instruments
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| Derivative Instruments, Gain (Loss) | ||
| Fair value of derivative liabilities | 59,000,000 | 103,000,000 |
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Derivative instruments not designated as hedging instruments | Foreign exchange forward and swap contracts
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| Derivative Instruments, Gain (Loss) | ||
| Notional amount | 14,900,000,000 | 13,600,000,000 |
| Maximum length of time hedged | 1 year | |
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Derivative instruments not designated as hedging instruments | Equity contracts
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| Derivative Instruments, Gain (Loss) | ||
| Notional amount | $ 1,200,000,000 | $ 1,000,000,000 |