Condensed Consolidated Statements of Financial Position (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Condensed Consolidated Statements of Financial Position [Abstract]
Allowance for receivables (in dollars)	$ 24	$ 22
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	2,000,000,000	2,000,000,000
Common stock, shares issued (in shares)	148,256,197	147,872,959
Common stock, shares outstanding (in shares)	132,043,971	135,408,054
Treasury stock (in shares)	16,212,226	12,464,905