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Goodwill and Other Intangibles - Intangible Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Other Intangible Assets[Line Items] |  |  |
Indefinite-lived intangible assets, Trademarks | $ 10,498 | $ 10,498 |
Finite-lived intangible assets, accumulated amortization | (10,481) | (9,038) |
Intangible assets, gross | 41,623 | 42,159 |
Intangible assets, net | $ 31,142 | $ 33,121 |
Weighted Average Life (years) | 15 years 2 months 12 days | 15 years 1 month 6 days |
Amortization of intangible assets | $ 2,341 | $ 2,436 | $ 1,006
Customer contracts/relationships and covenants not to compete |  |  |
Other Intangible Assets[Line Items] |  |  |
Finite-lived intangible assets, gross carrying amount | 24,952 | 25,447 |
Finite-lived intangible assets, accumulated amortization | (8,923) | (8,128) |
Finite-lived intangible assets, net carrying amount | $ 16,029 | $ 17,319 |
Weighted Average Life (years) | 14 years 10 months 24 days | 14 years 9 months 18 days |
Technology |  |  |
Other Intangible Assets[Line Items] |  |  |
Finite-lived intangible assets, gross carrying amount | $ 1,060 | $ 1,060 |
Finite-lived intangible assets, accumulated amortization | (739) | (386) |
Finite-lived intangible assets, net carrying amount | $ 321 | $ 674 |
Weighted Average Life (years) | 3 years | 3 years |
Provider networks |  |  |
Other Intangible Assets[Line Items] |  |  |
Finite-lived intangible assets, gross carrying amount | $ 4,203 | $ 4,200 |
Finite-lived intangible assets, accumulated amortization | (440) | (229) |
Finite-lived intangible assets, net carrying amount | $ 3,763 | $ 3,971 |
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 | (119) | (63) |
Finite-lived intangible assets, net carrying amount | $ 471 | $ 527 |
Weighted Average Life (years) | 20 years | 20 years |
Other |  |  |
Other Intangible Assets[Line Items] |  |  |
Finite-lived intangible assets, gross carrying amount | $ 320 | $ 364 |
Finite-lived intangible assets, accumulated amortization | (260) | (232) |
Finite-lived intangible assets, net carrying amount | $ 60 | $ 132 |
Weighted Average Life (years) | 7 years 8 months 12 days | 8 years 1 month 6 days |

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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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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 + Details
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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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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- Definition Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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