Consolidated Balance Sheet (Parenthetical) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 72	$ 66
Accumulated Depreciation	6,989	6,660
Accumulated Amortization	$ 163	$ 146
Stockholders' Equity, Number of Shares, Par Value and Other Disclosures [Abstract]
Common stock, par value	$ 1.00	$ 1.00
Common stock, shares authorized	250	250
Common stock, shares issued	106	106
Common stock, shares outstanding	76	76
Treasury Stock	30	30