Debt Financing Arrangements (Long-Term Debt) (Details) (USD $) In Millions, unless otherwise specified					1 Months Ended	12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Mar. 31, 2011	Feb. 28, 2007 Convertible senior notes point eight seven five percent due two thousand fourteen [Member]	Dec. 31, 2013 Convertible senior notes point eight seven five percent due two thousand fourteen [Member]	Dec. 31, 2012 Convertible senior notes point eight seven five percent due two thousand fourteen [Member]	Dec. 31, 2013 Debentures four point four seven nine percent due in two thousand twenty one [Member]	Dec. 31, 2012 Debentures four point four seven nine percent due in two thousand twenty one [Member]	Dec. 31, 2013 Debentures five point four five percent due in two thousand eighteen [Member]	Dec. 31, 2012 Debentures five point four five percent due in two thousand eighteen [Member]	Dec. 31, 2013 Debentures five point seven six five percent due in two thousand forty one [Member]	Dec. 31, 2012 Debentures five point seven six five percent due in two thousand forty one [Member]	Dec. 31, 2013 Debentures five point three seven five percent due in two thousand thirty five [Member}	Dec. 31, 2012 Debentures five point three seven five percent due in two thousand thirty five [Member}	Dec. 31, 2013 Debentures five point nine three five percent due in two thousand thirty two [Member]	Dec. 31, 2012 Debentures five point nine three five percent due in two thousand thirty two [Member]	Dec. 31, 2013 Debentures four point zero one six percent due in two thousand forty three [Member]	Dec. 31, 2012 Debentures four point zero one six percent due in two thousand forty three [Member]	Dec. 31, 2013 Debentures four point five three five percent due in two thousand forty two [Member]	Dec. 31, 2012 Debentures four point five three five percent due in two thousand forty two [Member]	Dec. 31, 2013 Debentures eight point three seven five percent due in two thousand seventeen [ Member]	Dec. 31, 2012 Debentures eight point three seven five percent due in two thousand seventeen [ Member]	Dec. 31, 2013 Debentures seven point one two five percent due in two thousand thirteen [Member]	Dec. 31, 2012 Debentures seven point one two five percent due in two thousand thirteen [Member]	Dec. 31, 2013 Debentures seven point five percent due in two thousand twenty seven [Member]	Dec. 31, 2012 Debentures seven point five percent due in two thousand twenty seven [Member]	Dec. 31, 2013 Debentures seven percent due in two thousand thirty one [Member]	Dec. 31, 2012 Debentures seven percent due in two thousand thirty one [Member]	Dec. 31, 2013 Debentures six point six two five percent due in two thousand twenty nine [Member]	Dec. 31, 2012 Debentures six point six two five percent due in two thousand twenty nine [Member]	Dec. 31, 2013 Debentures six point four five percent due in two thousand thirty eight [Member]	Dec. 31, 2012 Debentures six point four five percent due in two thousand thirty eight [Member]	Dec. 31, 2013 Debentures six point nine five due in two thousand ninety seven [Member]	Dec. 31, 2012 Debentures six point nine five due in two thousand ninety seven [Member]	Dec. 31, 2013 Debentures six point seven five percent due in two thousand twenty seven [Member]	Dec. 31, 2012 Debentures six point seven five percent due in two thousand twenty seven [Member]	Dec. 31, 2013 Other [Member]	Dec. 31, 2012 Other [Member]
Debt Instruments [Line Items]
Long-term Debt	$ 6,512	$ 6,724				$ 1,144	$ 1,095	$ 746	$ 754	$ 699	$ 700	$ 600	$ 600	$ 588	$ 588	$ 416	$ 416	$ 376	$ 374	$ 373	$ 371	$ 294	$ 293	$ 0	$ 243	$ 186	$ 186	$ 184	$ 184	$ 182	$ 182	$ 153	$ 153	$ 170	$ 170	$ 122	$ 122	$ 279	$ 293
Current maturities	(1,165)	(268)
Total long-term debt	5,347	6,456
Debt Instrument, Face Amount			$ 1,750	$ 1,750		$ 1,150		$ 750		$ 700		$ 596		$ 600		$ 420		$ 570		$ 528		$ 295		$ 243		$ 187		$ 185		$ 182		$ 154		$ 172		$ 124
Interest rate stated percentage			4.70%		0.875%	0.875%		4.479%		5.45%		5.765%		5.375%		5.935%		4.016%		4.535%		8.375%		7.125%		7.50%		7.00%		6.625%		6.45%		6.95%		6.75%
Debt instrument, maturity year					2014	2014		2021		2018		2041		2035		2032		2043		2042		2017		2013		2027		2031		2029		2038		2097		2027