Consolidated Statements of Financial Position (Unaudited) (Parenthetical) (Parentheticals) (USD $) In Millions, except Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Allowance for doubtful accounts	$ 56	$ 55
Common stock, par value	$ 0	$ 0
Common stock, shares authorized	400,000,000	400,000,000
Common stock, shares issued	177,016,824	177,087,230
Common stock, shares outstanding	177,016,824	177,087,230