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Business Acquisitions - Intangible Assets Acquired as Part of Acquisition (Details) - Aetna Group Insurance $ in Millions	Nov. 01, 2017 USD ($)
Business Acquisition [Line Items]
Amount	$ 629
Value of in-force contracts
Business Acquisition [Line Items]
Amount	$ 23
Estimated Useful Life	1 year
Customer relationships
Business Acquisition [Line Items]
Amount	$ 590
Estimated Useful Life	15 years
Marketing agreement with Aetna
Business Acquisition [Line Items]
Amount	$ 16
Estimated Useful Life	15 years

X

- 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://www.xbrl.org/2003/role/presentationRef
-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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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Definition

Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

+ References

No definition available.

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- Details

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