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Business Combinations - Intangible Assets (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets value	$ 235
Intangible assets amortization period	6 years 6 months
Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible asset useful life	5 years
Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible asset useful life	16 years
Contract rights - member list
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets value	$ 193
Intangible assets amortization period	5 years 3 months 18 days
Contract rights - member list | Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible asset useful life	5 years
Contract rights - member list | Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible asset useful life	10 years
Provider network
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets value	$ 27
Intangible asset useful life	10 years
Intangible assets amortization period	10 years
Trade name
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets value	$ 15
Intangible assets amortization period	15 years 4 months 24 days
Trade name | Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible asset useful life	10 years
Trade name | Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible asset useful life	16 years

X

- Definition

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+ References

No definition available.

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- Definition

The amount of identifiable intangible assets recognized as of the acquisition date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 55
-Paragraph 37
-URI http://asc.fasb.org/extlink&oid=121600890&loc=d3e2207-128464

Reference 2: 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=121647850&loc=d3e4845-128472

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Remaining amortization period of finite-lived intangible 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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 926
-SubTopic 20
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=120154696&loc=d3e54445-107959

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