Consolidated Condensed Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Statement Of Financial Position [Abstract]
Allowances for doubtful accounts receivable	$ 18	$ 16
Common stock, par value	$ 1.00	$ 1.00
Common stock, shares authorized	12,000	12,000
Common stock, shares issued	12,000	12,000
Common stock, shares outstanding	12,000	12,000