Consolidated Statements of Changes in Equity (USD $) In Millions, except Share data	Total	Common Stock [Member]	Retained Earnings	Accumulated Translation Adjustment [Member]	Other Postretirement Benefit Plan, Defined Benefit [Member]	Accumulated Net Unrealized Investment Gain (Loss) [Member]	Accumulated Other Comprehensive Loss	Non-controlling Interest
Beginning Balance at Dec. 31, 2010	$ 6,767	$ 3,440	$ 3,431				$ (149)	$ 45
Beginning Balance, shares at Dec. 31, 2010		169,428,000
Net Income	720		711					9
Dividends declared on common stock	(392)		(392)
Repurchase of common stock, Shares		(1,184,000)
Repurchase of Common Stock, Value	(58)	(58)
Other Comprehensive Income (Loss), Net of Tax	(9)				(9)
Stock-based compensation, distributions to noncontrolling interests and other, Shares		1,003,000
Stock-based compensation, distributions to noncontrolling interests and other	25	35						(10)
Ending Balance at Dec. 31, 2011	7,053	3,417	3,750				(158)	44
Ending Balance, shares at Dec. 31, 2011		169,247,000
Net Income	618		610					8
Dividends declared on common stock	(414)		(414)
Issuance of common stock, Shares		684,000
Issuance of common stock, Value	39	39
Contribution of Common Stock to Pension Plan Shares		1,335,000
Contribution of Common Stock to Pension Plan	80	80
Other Comprehensive Income (Loss), Net of Tax	0			1	(2)	1
Stock-based compensation, distributions to noncontrolling interests and other, Shares		1,086,000
Stock-based compensation, distributions to noncontrolling interests and other	35	51	(2)					(14)
Ending Balance at Dec. 31, 2012	7,411	3,587	3,944				(158)	38
Ending Balance, shares at Dec. 31, 2012	172,351,680	172,352,000
Net Income	668		661					7
Dividends declared on common stock	(454)		(454)
Issuance of common stock, Shares		589,000
Issuance of common stock, Value	39	39
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	22			(2)	22	2
Stock-based compensation, distributions to noncontrolling interests and other, Shares		1,120,000
Stock-based compensation, distributions to noncontrolling interests and other	68	81	(1)					(12)
Ending Balance at Dec. 31, 2013	$ 7,954	$ 3,907	$ 4,150				$ (136)	$ 33
Ending Balance, shares at Dec. 31, 2013	177,087,230	177,087,000