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Financing Financing (Covenants and Redemption Provisions Applicable to the Notes) (Narrative) (Details)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2015
Bonds | Swiss franc-denominated senior unsecured bonds    
Debt Instrument [Line Items]    
Debt instrument, percentage of principal amount redeemed, threshold 85.00%  
Bonds | 4.0% bonds due 2016    
Debt Instrument [Line Items]    
Debt instrument, redemption price, percentage   100.00%
Senior notes    
Debt Instrument [Line Items]    
Percentage of notes' principal in addition to accrued interest that redemption price must equal or be greater than if a credit downgrade or change in control occurs   101.00%