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Business Acquisitions - Intangible Assets Recorded in Connection with the Acquisition (Details) - Aetna Group Insurance [Member] $ in Millions	Nov. 01, 2017 USD ($)
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired	$ 629
Value of in-force contracts
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired	$ 23
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	1 year
Customer relationships [1]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired	$ 590
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	15 years
Marketing agreement with Aetna
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired	$ 16
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	15 years
Software and Software Development Costs [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	5 years
Intangible Assets Arising from Insurance Contracts Acquired in Business Combination [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	12 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://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

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- Definition

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+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
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