Condensed Consolidated Statements of Financial Position (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Condensed Consolidated Statements of Financial Position [Abstract]
Allowance for receivables (in dollars)	$ 25	$ 23
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)	143,789,569	143,170,897
Common stock, shares outstanding (in shares)	134,707,904	135,511,176
Treasury stock (in shares)	9,081,665	7,659,721