Software Development and Intellectual Property Licenses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Software development and intellectual property licenses:
Internally-developed software costs	$ 345	$ 291
Payments made to third-party software developers	31	38
Total software development costs	376	329
Amortization:
Amortization of capitalized software development costs and intellectual property licenses	$ 241	$ 501	$ 314