Accounting Policies and Supplemental Disclosures - Video and Music Content (Details) - USD ($) $ in Billions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Accounting Policies [Abstract]
Video and Music Content, Capitalized Costs	$ 6.1		$ 6.1		$ 5.8
Video and Music Content, Expense	$ 2.8	$ 1.8	$ 5.2	$ 3.5