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Network
2412405 - Disclosure - Income Taxes (Change In The Carrying Amount Of Gross Unrecognized Tax Benefits From Uncertain Tax Positions) (Details)
(http://www.antheminc.com/role/IncomeTaxesChangeInCarryingAmountOfGrossUnrecognizedTaxBenefitsFromUncertainTaxPositionsDetails)
Table(Implied)
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001156039 (http://www.sec.gov/CIK)
Income Tax Disclosure [Abstract]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
Income Tax Disclosure [Abstract]
 
 
Change in carrying amount of gross unrecognized tax benefits from uncertain tax positions
 
 
Balance at January 1
212,000,000  
115,800,000  
Additions for tax positions related to current year
0  
39,800,000  
Additions for tax positions related to prior years
13,900,000  
65,100,000  
Reductions related to tax positions of current year
(1,100,000) 
0  
Reductions related to tax positions of prior years
(88,400,000) 
(7,900,000) 
Reductions related to settlements with taxing authorities
(5,300,000) 
(800,000) 
Balance at December 31
131,100,000  
 
212,000,000