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Intangible Assets Intangible Assets - Schedule of Amortization Expense of Intangible Assets (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]      
Amortization expense $ 1,299 $ 347 $ 326