Consolidated Statements of Financial Position (Unaudited) (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Current Assets:
Allowance for doubtful accounts	$ 60	$ 55
Stockholders' Equity:
Common stock, par value	$ 0	$ 0
Common stock, shares authorized	400,000,000	400,000,000
Common stock, shares issued	176,991,277	177,087,230
Common stock, shares outstanding	176,991,277	177,087,230