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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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Goodwill and Intangible Assets Disclosure [Abstract] |  |
Non-amortizable intangible assets | $ 17,200 | $ 17,201
Amortizable intangible assets | 2,330 | 2,328
Total intangible assets, gross | 19,530 | 19,529
Accumulated amortization | (1,572) | (1,527)
Intangible assets, net | $ 17,958 | $ 18,002

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