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Goodwill and Intangible Assets, Net - Intangible Assets Balances (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Cost	$ 432	$ 199
Accumulated Amortization	183	170
Carrying Amount	249	29
Contract rights and licenses
Finite-Lived Intangible Assets [Line Items]
Cost	370	179
Accumulated Amortization	168	156
Carrying Amount	202	23
Provider networks
Finite-Lived Intangible Assets [Line Items]
Cost	47	20
Accumulated Amortization	15	14
Carrying Amount	32	6
Trade name
Finite-Lived Intangible Assets [Line Items]
Cost	15	0
Accumulated Amortization	0	0
Carrying Amount	$ 15	$ 0

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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ 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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