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Acquisitions - Schedule of Preliminary Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions | Jul. 01, 2018 | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Assets acquired and liabilities assumed |  |  |
Goodwill |  | $ 6,981 | $ 7,015
Acquired intangibles, weighted average useful life years | 13 years |  |
Fidelis Care |  |  |
Assets acquired and liabilities assumed |  |  |
Cash and cash equivalents | $ 2,001 |  |
Premium and related receivables | 510 |  |
Other current assets | 31 |  |
Restricted deposits | 495 |  |
Property, software and equipment, net | 48 |  |
Intangible assets | 956 |  |
Other long-term assets | 1 |  |
Total assets acquired | 4,042 |  |
Medical claims liability | 1,210 |  |
Accounts payable and accrued expenses | 258 |  |
Return of premium payable | 123 |  |
Unearned revenue | 115 |  |
Other long-term liabilities | 300 |  |
Total liabilities assumed | 2,006 |  |
Total identifiable net assets | 2,036 |  |
Goodwill | 1,591 |  |
Total assets acquired and liabilities assumed | $ 3,627 |  |
Acquired intangibles, weighted average useful life years | 13 years |  |
Fidelis Care | Customer relationships |  |  |
Assets acquired and liabilities assumed |  |  |
Intangible assets | $ 711 |  |
Acquired intangibles, weighted average useful life years | 11 years |  |
Fidelis Care | Trade name |  |  |
Assets acquired and liabilities assumed |  |  |
Intangible assets | $ 196 |  |
Acquired intangibles, weighted average useful life years | 20 years |  |
Fidelis Care | Provider contracts |  |  |
Assets acquired and liabilities assumed |  |  |
Intangible assets | $ 33 |  |
Acquired intangibles, weighted average useful life years | 15 years |  |
Fidelis Care | Developed technologies |  |  |
Assets acquired and liabilities assumed |  |  |
Intangible assets | $ 16 |  |
Acquired intangibles, weighted average useful life years | 2 years |  |

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- Definition Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Return Of Premium Payable + References No definition available. + Details
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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount of deferred revenue expected to be recognized as such within one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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