Condensed Consolidated Statements of Financial Position (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Condensed Consolidated Statements of Financial Position [Abstract]
Allowance for receivables (in dollars)	$ 24	$ 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)	143,563,741	143,170,897
Common stock, shares outstanding (in shares)	135,442,846	135,511,176
Treasury stock (in shares)	8,120,895	7,659,721