Schedule II-Condensed Financial Information Of Registrant (Statement Of Cash Flows) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating activities
Net income	$ 2,569.7us-gaap_NetIncomeLoss	$ 2,489.7us-gaap_NetIncomeLoss	$ 2,655.5us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Net realized losses on investments	(177.0)us-gaap_RealizedInvestmentGainsLosses	(271.9)us-gaap_RealizedInvestmentGainsLosses	(334.9)us-gaap_RealizedInvestmentGainsLosses
Other-than-temporary impairment losses recognized in income	49.0	98.9	37.8
Loss on extinguishment of debt	81.1	145.3	0
Loss on disposal of assets	(1.7)	3.9	4.7
Deferred income taxes	30.7us-gaap_DeferredIncomeTaxExpenseBenefit	59.1us-gaap_DeferredIncomeTaxExpenseBenefit	127.5us-gaap_DeferredIncomeTaxExpenseBenefit
Amortization, net of accretion	744.5us-gaap_AdjustmentForAmortization	800.9us-gaap_AdjustmentForAmortization	633.6us-gaap_AdjustmentForAmortization
Depreciation	106.5us-gaap_Depreciation	107.9us-gaap_Depreciation	107.1us-gaap_Depreciation
Share-based compensation cost	168.9us-gaap_ShareBasedCompensation	146.0us-gaap_ShareBasedCompensation	146.5us-gaap_ShareBasedCompensation
Excess tax benefits from share-based compensation	(46.4)	(30.1)	(28.8)
Changes in operating assets and liabilities:
Receivables, net	(1,899.7)us-gaap_IncreaseDecreaseInReceivables	(418.3)us-gaap_IncreaseDecreaseInReceivables	189.9us-gaap_IncreaseDecreaseInReceivables
Other invested assets, current	(21.7)	(15.1)	(38.9)
Other assets	405.5	(33.6)	79.2
Accounts payable and accrued expenses	(14.4)	303.6	(406.5)
Other liabilities	(7.9)	(154.6)	(132.8)
Income taxes	(34.0)	9.3	(73.9)
Net cash provided by operating activities	3,369.3	3,052.3	2,744.6
Investing activities
Settlement of non-hedging derivatives	(67.4)	(109.8)	(59.8)
Changes in securities lending collateral	(545.6)	(405.1)	307.9
Other, net	(0.1)	1.3	3.1
Net cash (used in) provided by investing activities	(974.9)	(2,234.4)	(4,551.6)
Financing activities
Net repayments of commercial paper borrowings	(379.2)	(191.7)	(229.0)
Proceeds from long-term borrowings	2,700.0	1,250.0	6,468.9
Repayments of long term borrowings	(1,730.1)us-gaap_RepaymentsOfLongTermDebt	(1,801.9)us-gaap_RepaymentsOfLongTermDebt	(1,251.3)us-gaap_RepaymentsOfLongTermDebt
Changes in securities lending payable	545.6	405.0	(307.8)
Changes in bank overdrafts	173.0	9.9	(17.6)
Premiums paid on equity options	0	(25.8)	0
Repurchase and retirement of common stock	(2,998.8)	(1,620.1)	(2,496.8)
Cash dividends	(480.7)us-gaap_PaymentsOfDividends	(448.0)us-gaap_PaymentsOfDividends	(367.1)us-gaap_PaymentsOfDividends
Proceeds from issuance of common stock under employee stock plans	301.3	524.7	110.8
Excess tax benefits from share-based compensation	46.4	30.1	28.8
Net cash (used in) provided by financing activities	(1,822.5)	(1,717.8)	2,088.9
Change in cash and cash equivalents	564.8	(897.7)	283.0
Cash and cash equivalents at beginning of year	1,582.1	2,475.3
Cash and cash equivalents at end of year	2,151.7	1,582.1	2,475.3
Anthem, Inc. [Member]
Operating activities
Net income	2,569.7	2,489.7	2,655.5
Adjustments to reconcile net income to net cash provided by operating activities:
Distributed (undistributed) earnings of subsidiaries	244.3	(78.5)	(432.0)
Net realized losses on investments	27.1	83.2	28.5
Other-than-temporary impairment losses recognized in income	28.5	51.4	14.0
Loss on extinguishment of debt	81.1	145.3	0
Loss on disposal of assets	3.9	3.6	0
Deferred income taxes	52.7	(4.5)	49.2
Amortization, net of accretion	17.5	25.2	23.2
Depreciation	67.4	45.7	13.1
Share-based compensation cost	168.9	146.0	146.5
Excess tax benefits from share-based compensation	(46.4)	(30.1)	(28.8)
Changes in operating assets and liabilities:
Receivables, net	(16.6)	3.5	9.6
Other invested assets, current	(3.8)	(0.3)	0.2
Other assets	55.6	42.3	(31.7)
Amounts due from/to subsidiaries	566.1	(983.1)	754.7
Accounts payable and accrued expenses	(111.4)	111.8	(34.5)
Other liabilities	(113.8)	(18.6)	8.9
Income taxes	(36.0)	83.9	(204.0)
Net cash provided by operating activities	3,554.8	2,116.5	2,972.4
Investing activities
Purchases of investments	(1,819.3)	(1,964.3)	(5,383.2)
Proceeds from sales, maturities, calls and redemptions of investments	820.7	2,443.3	5,554.5
Settlement of non-hedging derivatives	(67.4)	(109.8)	(59.8)
Capitalization of subsidiaries	(321.8)	(121.2)	(6,085.1)
Changes in securities lending collateral	(178.8)	(17.0)	73.8
Purchases of property and equipment, net of sales	(57.0)	(87.4)	(117.1)
Other, net	(38.0)	(18.9)	(114.4)
Net cash (used in) provided by investing activities	(1,661.6)	124.7	(6,131.3)
Financing activities
Net repayments of commercial paper borrowings	(379.2)	(191.7)	(229.0)
Proceeds from long-term borrowings	2,700.0	1,250.0	6,468.9
Repayments of long term borrowings	(1,730.1)	(1,245.0)	(800.0)
Changes in securities lending payable	178.6	17.1	(72.7)
Changes in bank overdrafts	55.5	71.8	30.5
Premiums paid on equity options	0	(25.8)	0
Repurchase and retirement of common stock	(2,998.8)	(1,620.1)	(2,496.8)
Cash dividends	(501.6)	(465.9)	(380.9)
Proceeds from issuance of common stock under employee stock plans	301.3	524.7	110.8
Excess tax benefits from share-based compensation	46.4	30.1	28.8
Net cash (used in) provided by financing activities	(2,327.9)	(1,654.8)	2,659.6
Change in cash and cash equivalents	(434.7)	586.4	(499.3)
Cash and cash equivalents at beginning of year	1,174.5	588.1	1,087.4
Cash and cash equivalents at end of year	$ 739.8	$ 1,174.5	$ 588.1

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Reference 10: http://www.xbrl.org/2003/role/presentationRef

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The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting.

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The cash outflow for derivative instruments during the period, which are classified as investing activities, excluding those designated as hedging instruments.

+ References

No definition available.

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The cash outflow for a financial contract that meets the hedge criteria as either cash flow hedge, fair value hedge or hedge of net investment in foreign operations.

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The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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The cash outflow to reacquire common stock during the period.

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Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

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The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity.

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-Paragraph 13

-Subparagraph (a),(b)

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The cash outflow associated with extending a long-term loan to a related party. Alternate caption: Payments for Advances to Affiliates.

+ References

No definition available.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

+ References

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The cash inflow associated with the maturity (principal being due), prepayment and call (request of early payment) of other investments not otherwise defined in the taxonomy.

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The net cash inflow or cash outflow from issuing (borrowing) and repaying commercial paper.

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-Name Accounting Standards Codification

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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-Paragraph 3

-Subparagraph a

-Article 7

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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-Publisher FASB

-Name Accounting Standards Codification

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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