Goodwill and Other Intangibles - Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Other Intangible Assets[Line Items]
Indefinite-lived intangible assets, Trademarks	$ 10,498	$ 10,498
Finite-lived intangible assets, accumulated amortization	(12,727)	(10,481)
Intangible assets, gross	41,753	41,623
Intangible assets, net	$ 29,026	$ 31,142
Weighted Average Life (years)	15 years 3 months 18 days	15 years 2 months 12 days
Amortization of intangible assets	$ 2,259	$ 2,341	$ 2,436
Customer contracts/relationships and covenants not to compete
Other Intangible Assets[Line Items]
Finite-lived intangible assets, gross carrying amount	25,084	24,952
Finite-lived intangible assets, accumulated amortization	(10,564)	(8,923)
Finite-lived intangible assets, net carrying amount	$ 14,520	$ 16,029
Weighted Average Life (years)	15 years	14 years 10 months 24 days
Technology
Other Intangible Assets[Line Items]
Finite-lived intangible assets, gross carrying amount	$ 1,060	$ 1,060
Finite-lived intangible assets, accumulated amortization	(1,060)	(739)
Finite-lived intangible assets, net carrying amount	$ 0	$ 321
Weighted Average Life (years)	3 years	3 years
Provider networks
Other Intangible Assets[Line Items]
Finite-lived intangible assets, gross carrying amount	$ 4,203	$ 4,203
Finite-lived intangible assets, accumulated amortization	(651)	(440)
Finite-lived intangible assets, net carrying amount	$ 3,552	$ 3,763
Weighted Average Life (years)	20 years	20 years
Value of Business Acquired
Other Intangible Assets[Line Items]
Finite-lived intangible assets, gross carrying amount	$ 590	$ 590
Finite-lived intangible assets, accumulated amortization	(173)	(119)
Finite-lived intangible assets, net carrying amount	$ 417	$ 471
Weighted Average Life (years)	20 years	20 years
Other
Other Intangible Assets[Line Items]
Finite-lived intangible assets, gross carrying amount	$ 318	$ 320
Finite-lived intangible assets, accumulated amortization	(279)	(260)
Finite-lived intangible assets, net carrying amount	$ 39	$ 60
Weighted Average Life (years)	8 years 4 months 24 days	7 years 8 months 12 days

-- None. No documentation exists for this element. --

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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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- Definition

Weighted average period before the next renewal or extension (both explicit and implicit) for intangible assets that have been renewed or extended, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

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

+ References

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- Definition

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

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

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- Definition

Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

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Amount before accumulated amortization of intangible assets, excluding goodwill.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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