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Schedule II-Condensed Financial Information of Registrant (Statement of Comprehensive Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net income	$ 506.7us-gaap_NetIncomeLoss	$ 630.9us-gaap_NetIncomeLoss	$ 731.1us-gaap_NetIncomeLoss	$ 701.0us-gaap_NetIncomeLoss	$ 148.2us-gaap_NetIncomeLoss	$ 656.2us-gaap_NetIncomeLoss	$ 800.1us-gaap_NetIncomeLoss	$ 885.2us-gaap_NetIncomeLoss	$ 2,569.7us-gaap_NetIncomeLoss	$ 2,489.7us-gaap_NetIncomeLoss	$ 2,655.5us-gaap_NetIncomeLoss
Other comprehensive (loss) income, net of tax:
Change in net unrealized gains/losses on investments									118.6	(294.7)	189.9
Change in non-credit component of other-than-temporary impairment losses on investments									(3.9)	1.7	4.5
Change in net unrealized gains/losses on cash flow hedges									(3.6)	3.0	0.1
Change in net periodic pension and postretirement benefits									(118.1)	172.7	(10.9)
Foreign currency translation adjustments									(4.3)	1.4	0.6
Other comprehensive (loss) income									(11.3)	(115.9)	184.2
Total comprehensive income									2,558.4us-gaap_ComprehensiveIncomeNetOfTax	2,373.8us-gaap_ComprehensiveIncomeNetOfTax	2,839.7us-gaap_ComprehensiveIncomeNetOfTax
Anthem, Inc. [Member]
Net income									2,569.7	2,489.7	2,655.5
Other comprehensive (loss) income, net of tax:
Change in net unrealized gains/losses on investments									118.6	(294.7)	189.9
Change in non-credit component of other-than-temporary impairment losses on investments									(3.9)	1.7	4.5
Change in net unrealized gains/losses on cash flow hedges									(3.6)	3.0	0.1
Change in net periodic pension and postretirement benefits									(118.1)	172.7	(10.9)
Foreign currency translation adjustments									(4.3)	1.4	0.6
Other comprehensive (loss) income									(11.3)	(115.9)	184.2
Total comprehensive income									$ 2,558.4	$ 2,373.8	$ 2,839.7