Consolidated Statements of Changes in Equity (Unaudited) (USD $) In Millions, except Share data	Total	Common Stock	Retained Earnings	Accumulated Other Comprehensive Loss	Accumulated Translation Adjustment [Member]	Accumulated Defined Benefit Plans Adjustment [Member]	Accumulated Net Unrealized Investment Gain (Loss) [Member]	Non-controlling Interest
Stockholders' Equity, Including Portion Attributable to Noncontrolling interest at Dec. 31, 2012	$ 7,411	$ 3,587	$ 3,944	$ (158)				$ 38
Beginning Balance, shares at Dec. 31, 2012	172,351,680	172,352,000
Net Income	542		537					5
Dividends declared on common stock	(339)		(339)
Stock Issued During Period, Shares, New Issues		439,000
Issuance of common stock, value	29	29
Contribution of Common Stock to Pension Plan Shares		3,026,000
Contribution of Common Stock to Pension Plan	200	200
Other Comprehensive Income (Loss), Net of Tax	7				(1)	7	1
Stock-based compensation, distributions to noncontrolling interests and other, shares		980,000
Stock-based compensation, distributions to noncontrolling interests and other	60	69						(9)
Stockholders' Equity, Including Portion Attributable to Noncontrolling interest at Sep. 30, 2013	7,910	3,885	4,142	(151)				34
Ending Balance, shares at Sep. 30, 2013	176,797,248	176,797,000
Stockholders' Equity, Including Portion Attributable to Noncontrolling interest at Jun. 30, 2013
Net Income	200
Other Comprehensive Income (Loss), Net of Tax	4				(1)	2	1
Stockholders' Equity, Including Portion Attributable to Noncontrolling interest at Sep. 30, 2013	$ 7,910			$ (151)
Ending Balance, shares at Sep. 30, 2013	176,797,248