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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
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Goodwill and Intangible Assets Disclosure [Abstract] |  |
Non-amortizable intangible assets | $ 17,288 | $ 17,671
Amortizable intangible assets | 2,341 | 2,386
Total intangible assets, gross | 19,629 | 20,057
Accumulated amortization | (1,493) | (1,418)
Intangible assets, net | $ 18,136 | $ 18,639

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