Accounting Policies and Supplemental Disclosures - Video and Music Content (Details) - USD ($) $ in Billions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Accounting Policies [Abstract]
Digital video and music content, capitalized costs	$ 7.8		$ 6.8
Digital video and music content, expense	$ 3.0	$ 2.4