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Commitments and Contingent Liabilities - (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 109 Months Ended
Jan. 31, 2015
Feb. 28, 2017
Jan. 31, 2015
Dec. 31, 2005
Loss Contingencies [Line Items]        
Amount paid on contract     $ 20  
District of Maryland        
Loss Contingencies [Line Items]        
Accrual for litigation   $ 140    
District of Maryland | Judicial Ruling        
Loss Contingencies [Line Items]        
Purchase price in litigation $ 114      
Litigation interest rate 12.00%   12.00%  
Original Contract        
Loss Contingencies [Line Items]        
Purchase price       $ 200
Renegotiated Contract        
Loss Contingencies [Line Items]        
Purchase price   $ 134