Schedule II-Condensed Financial Information Of Registrant (Balance Sheets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 1,582.1	$ 2,475.3	$ 2,201.6
Fixed maturity securities (amortized cost of $897.4 and $1,415.5)	17,038.2	16,912.9
Equity securities (cost of $52.6 and $26.7)	1,735.5	1,212.4
Other invested assets, current	16.3	14.8
Other receivables	1,063.3	927.6
Income taxes receivable	235.7	228.5
Securities lending collateral	969.8	564.6
Deferred tax assets, net	383.0	236.4
Other current assets	1,677.5	1,827.4
Total current assets	29,745.8	29,347.5
Equity securities (cost of $6.7 and $6.8)	31.3	30.1
Other Long Term Investments	1,542.6	1,387.6
Property and equipment, net	1,801.5	1,717.3
Other noncurrent assets	645.2	486.1
Total assets	59,574.5	58,955.4
Current liabilities:
Accounts payable and accrued expenses	3,426.3	3,098.7
Security trades pending payable	95.2	69.3
Securities lending payable	969.7	564.7
Current portion of long-term debt	518.0	557.1
Other current liabilities	1,674.7	1,769.8
Total current liabilities	16,351.5	15,995.0
Long-term debt, less current portion	13,573.6	14,170.8
Other noncurrent liabilities	836.0	1,013.2
Total liabilities	34,809.3	35,152.7
Commitments and contingencies-Note 5
Shareholders' equity
Preferred stock, without par value, shares authorized—100,000,000; shares issued and outstanding—none	0	0
Common stock, par value $0.01, shares authorized—900,000,000; shares issued and outstanding: 293,273,830 and 304,715,144	2.9	3.0
Additional paid-in capital	10,765.2	10,853.5
Retained earnings	13,813.9	12,647.1
Accumulated other comprehensive income	183.2	299.1
Total shareholders' equity	24,765.2	23,802.7	23,288.2	23,812.6
Total liabilities and shareholders' equity	59,574.5	58,955.4
WellPoint, Inc. [Member]
Current assets:
Cash and cash equivalents	1,174.5	588.1
Fixed maturity securities (amortized cost of $897.4 and $1,415.5)	900.4	1,425.9
Equity securities (cost of $52.6 and $26.7)	89.6	15.0
Other invested assets, current	1.9	1.6
Other receivables	35.6	37.7
Income taxes receivable	154.4	227.0
Net due from subsidiaries	893.4	0
Securities lending collateral	46.2	29.1
Deferred tax assets, net	11.8	7.9
Other current assets	183.1	145.7
Total current assets	3,490.9	2,478.0
Equity securities (cost of $6.7 and $6.8)	6.7	6.8
Other Long Term Investments	615.7	596.4
Property and equipment, net	148.3	110.2
Deferred tax assets, net	2.9	23.8
Investment in subsidiaries	35,516.2	35,462.2
Other noncurrent assets	152.3	218.9
Total assets	39,933.0	38,896.3
Current liabilities:
Accounts payable and accrued expenses	592.1	402.1
Security trades pending payable	28.9	17.7
Securities lending payable	46.2	29.1
Net due to subsidiaries	0	89.7
Current portion of long-term debt	518.0	0
Other current liabilities	213.4	214.6
Total current liabilities	1,398.6	753.2
Long-term debt, less current portion	13,548.6	14,145.9
Other noncurrent liabilities	220.6	194.5
Total liabilities	15,167.8	15,093.6
Commitments and contingencies-Note 5
Shareholders' equity
Preferred stock, without par value, shares authorized—100,000,000; shares issued and outstanding—none	0	0
Common stock, par value $0.01, shares authorized—900,000,000; shares issued and outstanding: 293,273,830 and 304,715,144	2.9	3.0
Additional paid-in capital	10,765.2	10,853.5
Retained earnings	13,813.9	12,647.1
Accumulated other comprehensive income	183.2	299.1
Total shareholders' equity	24,765.2	23,802.7
Total liabilities and shareholders' equity	$ 39,933.0	$ 38,896.3