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Intangible Assets - Definite Life Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Definite life intangible assets:
Amortization of intangible assets	$ 38	$ 6	$ 103	$ 17
Retired
Definite life intangible assets:
Intangible assets	0		0
Pandora
Definite life intangible assets:
Finite-lived intangible assets	$ 776		$ 776