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Contingencies (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Jun. 30, 2015
Assessment for 2002 [Member]        
Assessment of contingencies, including penalties and accruing interest, reduced $ 25      
Assessment of contingencies, prior to reductions 59      
Derivative actions [Member]        
Estimated Litigation Liability       $ 4
Brockton [Member]        
Litigation Settlement, Amount   $ 62    
Insurance Settlements Receivable, Current   60    
Payments for legal settlements   $ 2    
ERISA [Member]        
Litigation Settlement, Amount (6)      
Estimated Litigation Liability 1      
Insurance Settlements Receivable, Current 5      
IPI [Member] | Assessment for 2012 [Member]        
Assessment of contingencies, including penalties and accruing interest $ 280      
DOJ [Member] | FCPA [Member]        
Litigation Settlement, Amount     $ 68  
SEC [Member] | FCPA [Member]        
Litigation Settlement, Amount     $ 67