Consolidated Balance Sheet (Parenthetical) - USD ($) shares in Millions, $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Stockholders’ equity:
Common Stock, Shares Authorized	960	960
Common Stock, Par or Stated Value Per Share	$ 1	$ 1
Common Stock, Shares Issued	784	782
Treasury Stock, Shares	35	35
Allowance for Doubtful Accounts Receivable, Current	$ 3	$ 0