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Financial Instruments (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Financial Instruments and Fair Value [Line Items]      
Gross realized gains on the sale of our marketable securities $ 272,000,000 $ 357,000,000 $ 238,000,000
Gross realized losses on the sale of our marketable securities 482,000,000 565,000,000 85,000,000
OTTI on securities 0 281,000,000 $ 0
Cash collateral received from derivative financial instruments 362,000,000 192,000,000  
Effective portion of our cash flow hedges before tax effect 603,000,000    
Foreign currency gain (loss) to be reclassified during next 12 months 567,000,000    
Foreign exchange contracts | Fair Value of Derivatives Not Designated as Hedging Instruments      
Financial Instruments and Fair Value [Line Items]      
Notional amount of derivative 7,900,000,000 7,500,000,000  
Interest rate contracts      
Financial Instruments and Fair Value [Line Items]      
Notional amount of derivative 0 50,000,000  
Cash Flow Hedging Relationship | Foreign exchange contracts      
Financial Instruments and Fair Value [Line Items]      
Notional amount of derivative $ 10,700,000,000 16,400,000,000  
Foreign exchange option contracts, maximum maturities 36 months    
Derivatives in Fair Value Hedging Relationship | Foreign exchange contracts      
Financial Instruments and Fair Value [Line Items]      
Notional amount of derivative $ 2,400,000,000 1,800,000,000  
Derivatives in Fair Value Hedging Relationship | Interest rate contracts      
Financial Instruments and Fair Value [Line Items]      
Notional amount of derivative $ 0 $ 295,000,000