Software Development and Intellectual Property Licenses (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Software development and intellectual property licenses:
Internally-developed software costs	$ 354		$ 345
Payments made to third-party software developers	29		31
Total software development costs	383		$ 376
Amortization:
Amortization of capitalized software development costs and intellectual property licenses	$ 83	$ 110