Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Accounts receivable, Allowance for Doubtful Accounts	$ 59	$ 59
Common stock, par value (in dollars per share)	$ 0.1	$ 0.1
Common Stock, Shares Authorized	1,000,000,000	1,000,000,000
Common Stock, Shares, Outstanding	374,000,000	374,000,000