Software Development and Intellectual Property Licenses (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Software development and intellectual property licenses:
Internally-developed software costs	$ 510		$ 510		$ 345
Payments made to third-party software developers	33		33		31
Total software development costs	543		543		$ 376
Amortization:
Amortization of capitalized software development costs and intellectual property licenses	$ 37	$ 11	$ 149	$ 175