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2419403 - Disclosure - Capital Stock (Nonvested Restricted Stock Activity Including Restricted Stock Units) (Details)
(http://www.antheminc.com/role/CapitalStockNonvestedRestrictedStockActivityIncludingRestrictedStockUnitsDetails)
Table(Implied)
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001156039 (http://www.sec.gov/CIK)
Capital [Abstract]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
2014-01-01 - 2014-12-31
Capital [Abstract]
 
 
 
Restricted Stock Shares and Units
 
 
 
Nonvested at beginning of period, Restricted Stock Shares and Units
2,700,000  
  
Granted, Restricted Stock Shares and Units
1,100,000  
  
Vested, Restricted Stock Shares and Units
(1,400,000) 
  
Forfeited, Restricted Stock Shares and Units
(300,000) 
  
Nonvested at end of period, Restricted Stock Shares and Units
2,100,000  
 
2,700,000  
 
 
 
Weighted-Average Grant Date Fair Value per Share
 
 
 
Nonvested at beginning of period, Weighted-Average Grant Date Fair Value per Share
101.66  
  
Granted, Weighted-Average Grant Date Fair Value per Share
131.81  
147.00  
90.53  
Vested, Weighted-Average Grant Date Fair Value per Share
82.26  
  
Forfeited, Weighted-Average Grant Date Fair Value Per Share
119.94  
  
Nonvested at end of period, Weighted-Average Grant Date Fair Value per Share
127.68  
101.66