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Goodwill and Other Intangible Assets - Intangible Assets (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Nov. 28, 2018
Other Intangible Assets[Line Items] |  |  |
Finite-lived intangible assets, accumulated amortization | $ (7,214) | $ (6,299) |
Intangible assets, gross | 43,738 | 19,929 |
Intangible assets, net | $ 36,524 | $ 13,630 |
Weighted Average Life (years) | 15 years 3 months 18 days | 15 years 4 months 24 days |
Trademarks |  |  |
Other Intangible Assets[Line Items] |  |  |
Indefinite-lived intangible assets, Trademarks | $ 10,498 | $ 6,398 |
Customer contracts/relationships and covenants not to compete |  |  |
Other Intangible Assets[Line Items] |  |  |
Finite-lived intangible assets, gross carrying amount | 26,213 | 12,341 |
Finite-lived intangible assets, accumulated amortization | (6,349) | (5,536) |
Finite-lived intangible assets, net carrying amount | $ 19,864 | $ 6,805 |
Weighted Average Life (years) | 14 years 9 months 18 days | 15 years 3 months 18 days |
Technology |  |  |
Other Intangible Assets[Line Items] |  |  |
Finite-lived intangible assets, gross carrying amount | $ 1,060 |  |
Finite-lived intangible assets, accumulated amortization | (31) |  |
Finite-lived intangible assets, net carrying amount | $ 1,029 |  |
Weighted Average Life (years) | 3 years |  |
Provider networks |  |  |
Other Intangible Assets[Line Items] |  |  |
Finite-lived intangible assets, gross carrying amount | $ 4,200 |  |
Finite-lived intangible assets, accumulated amortization | (19) |  |
Finite-lived intangible assets, net carrying amount | $ 4,181 |  |
Weighted Average Life (years) | 20 years |  |
Value of Business Acquired |  |  |
Other Intangible Assets[Line Items] |  |  |
Finite-lived intangible assets, gross carrying amount | $ 590 |  |
Finite-lived intangible assets, accumulated amortization | (7) |  |
Finite-lived intangible assets, net carrying amount | $ 583 |  |
Weighted Average Life (years) | 20 years |  |
Favorable leases and other |  |  |
Other Intangible Assets[Line Items] |  |  |
Finite-lived intangible assets, gross carrying amount | $ 1,177 | $ 1,190 |
Finite-lived intangible assets, accumulated amortization | (808) | (763) |
Finite-lived intangible assets, net carrying amount | $ 369 | $ 427 |
Weighted Average Life (years) | 17 years 1 month 6 days | 16 years 2 months 12 days |
Aetna Inc. [Member] | Trademarks |  |  |
Other Intangible Assets[Line Items] |  |  |
Indefinite-lived intangible assets, gross fair value |  |  | $ 4,100

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