Consolidated Balance Sheets Parenthetical (Parentheticals) (USD $) In Millions, except Share data, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Current Assets [Abstract]
Allowance for uncollectible accounts	$ 20	$ 23
Allowance for obsolescence	113	118
Property, Plant and Equipment [Abstract]
Accumulated depreciation and amortization	8,959	7,792
Other Assets [Abstract]
Accumulated amortization	$ 782	$ 738
Stockholders' Equity
Common stock, par or stated value per share	$ 0.0001	$ 0.0001
Common stock, shares authorized	1,500,000,000	1,500,000,000
Common stock, shares issued	856,710,375	869,484,981
Treasury stock, shares	19,769,013	18,041,848