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Intangible Assets Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Finite-Lived Intangible Assets [Line Items]        
Amortization of Intangible Assets $ 47 $ 41 $ 94 $ 52