Basis of Presentation and Signficant Accounting Policies Adoption of New Accounting Pronouncement (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2014
Adoption of New Accounting Pronouncement [Abstract]
Patient Protection Affordable Care Act Health Insurance Provider Fee, annual amount to be collected by the Government through assessments to all health insurers subject to the fee	$ 8,000.0
Patient Protection Affordable Care Act Health Insurance Provider Fee, estimated amount	920.0
Patient Protection Affordable Care Act Health Insurance Provider Fee Expense Recognized	$ 230.0

Annual fee imposed on covered entities engaged in the business of providing health insurance for United States health risks. This fee is imposed by section 9010 of the Patient Protection and Affordable Care Act, as amended. The regulations affect persons engaged in the business of providing health insurance for United States health risks.

No definition available.

Name:	wlp_PatientProtectionAffordableCareActHealthInsuranceProviderFee
Namespace Prefix:	wlp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant