Debt And Lines Of Credit (Summary Of Long-Term Debt) (Details) (USD $) In Millions, unless otherwise specified						12 Months Ended												12 Months Ended										12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2007	Dec. 31, 2012 Early Debt Extinguishment Costs [Member]	Dec. 31, 2011 Early Debt Extinguishment Costs [Member]	Dec. 31, 2013 Eight Point Seven Percentage To Ten Percentage Notes Due Two Thousand Thirty Eight [Member]	Dec. 31, 2012 Eight Point Seven Percentage To Ten Percentage Notes Due Two Thousand Thirty Eight [Member]	Dec. 31, 2013 Nine Point Three Seven Five Percentage Note Due Two Thousand Nineteen [Member]	Dec. 31, 2012 Nine Point Three Seven Five Percentage Note Due Two Thousand Nineteen [Member]	Dec. 31, 2013 Seven Point Nine Five Percentage Debenture Due To Thousand Eighteen [Member]	Dec. 31, 2012 Seven Point Nine Five Percentage Debenture Due To Thousand Eighteen [Member]	Dec. 31, 2013 Seven Point Five Percentage Notes Due Two Thousand Twenty One [Member]	Dec. 31, 2012 Seven Point Five Percentage Notes Due Two Thousand Twenty One [Member]	Dec. 31, 2012 Seven Point Four Percentage Debenture Due Two Thousand Fourteen [Member]	Dec. 31, 2013 Seven Point Four Percentage Debenture Due Two Thousand Fourteen [Member]	Dec. 31, 2013 Seven Point Three Percentage Notes Due Two Thousand Thirty Nine [Member]	Dec. 31, 2012 Seven Point Three Percentage Notes Due Two Thousand Thirty Nine [Member]	Dec. 31, 2013 Six Point Eight Seven Five Percentage Notes Due Two Thousand Twenty Three To Two Thousand Twenty Nine [Member]	Dec. 31, 2012 Six Point Eight Seven Five Percentage Notes Due Two Thousand Twenty Three To Two Thousand Twenty Nine [Member]	Dec. 31, 2013 Six Point Six Five Percentage Notes Due Two Thousand Thirty Seven [Member] [Member]	Dec. 31, 2012 Six Point Six Five Percentage Notes Due Two Thousand Thirty Seven [Member] [Member]	Dec. 31, 2013 Six Point Four Percentage To Seven Point Seven Five Percentage Debenture Due Two Thousand Twenty Five To Two Thousand Twenty Seven [Member]	Dec. 31, 2012 Six Point Four Percentage To Seven Point Seven Five Percentage Debenture Due Two Thousand Twenty Five To Two Thousand Twenty Seven [Member]	Dec. 31, 2013 Six Point Three Seven Five Percentage To Six Point SIx Two Five Percentage Debenture Due Two Thousand Sixteen To Two Thousand Eighteen [Member]	Dec. 31, 2012 Six Point Three Seven Five Percentage To Six Point SIx Two Five Percentage Debenture Due Two Thousand Sixteen To Two Thousand Eighteen [Member]	Dec. 31, 2013 Six Point Zero Percentage Notes Due Two Thousand And Forty One [Member]	Dec. 31, 2012 Six Point Zero Percentage Notes Due Two Thousand And Forty One [Member]	Dec. 31, 2013 Five Point Two Five Percentage To Five Point Five Percentage Notes Due Two Thousand Fourteen To Two Thousand Sixteen [Member]	Dec. 31, 2012 Five Point Two Five Percentage To Five Point Five Percentage Notes Due Two Thousand Fourteen To Two Thousand Sixteen [Member]	Dec. 31, 2013 Four Point Seven Five Percentage Notes Due Two Thousand And Twenty Two [Member]	Dec. 31, 2012 Four Point Seven Five Percentage Notes Due Two Thousand And Twenty Two [Member]	Dec. 31, 2013 Variable Rate [Domain]		Dec. 31, 2012 Variable Rate [Domain]		Dec. 31, 2013 Municipal Bonds [Member]		Dec. 31, 2012 Municipal Bonds [Member]		Dec. 31, 2013 Short-term Debt [Member]		Dec. 31, 2012 Short-term Debt [Member]		Dec. 31, 2013 Long-term Debt [Member]		Dec. 31, 2012 Long-term Debt [Member]
Debt Instrument [Line Items]
Debt					$ 2,140			$ 264	$ 263	$ 848	$ 846	$ 1,429	$ 1,462	$ 999	$ 999	$ 303	$ 0	$ 721	$ 721	$ 130	$ 130	$ 4	$ 4	$ 142	$ 142	$ 364	$ 373	$ 585	$ 585	$ 657	$ 701	$ 899	$ 899	$ 269	[1]	$ 314	[1]	$ 1,487	[2]	$ 1,812	[2]					$ 304	[3]	$ 331	[3]
Short-term debt																																										386	[4]	255	[4]
Total debt	9,488	[5]	10,140	[5]
Less: current maturities	(661)		(444)
Long-term debt	$ 8,827		$ 9,696
Debt Instrument, Maturity Date								Jun. 15, 2038	Jun. 15, 2038	May 15, 2019	May 15, 2019	Jun. 15, 2018	Jun. 15, 2018	Aug. 15, 2021	Aug. 15, 2021	Jan. 15, 2014		Nov. 15, 2039	Nov. 15, 2039
Debt Instrument Original Maturity Date Minimum						2010	2010													2023	2023			2025	2025					2014	2014			2013		2012		2013		2012
Debt Instrument Original Maturity Date Maximum						2039	2039													2029	2029	2037	2037	2027	2027					2016	2016			2017		2017		2035		2035
Debt Instrument, Interest Rate, Stated Percentage										9.375%	9.375%	7.95%	7.95%	7.50%	7.50%	7.40%			7.30%	6.875%	6.875%	6.65%	6.65%
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum						1.625%	4.00%	8.70%	8.70%															6.40%	6.40%			6.00%	6.00%	5.25%	5.25%	4.75%	4.75%
Long Term Debt, Maturity Date																												2041	2041			2022	2022
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum						9.375%	9.375%	10.00%	10.00%															7.75%	7.75%					5.50%	5.50%

[1] The weighted average interest rate on these notes was 2.6% in 2013 and 2.6% in 2012.

[2] The weighted average interest rate on these bonds was 5.5% in 2013 and 5.6% in 2012.

[3] Includes $41 million at December 31, 2013 and $61 million at December 31, 2012, related to the unamortized gain on interest rate swap unwinds (see Note 14).

[4] The weighted average interest rate was 2.8% in 2013 and 2.2% in 2012. Includes $93 million at December 31, 2013 and $29 million at December 31, 2012 related to non-U.S. denominated borrowings with a weighted average interest rate of 5.8% in 2013 and 5.6% in 2012.

[5] The fair market value was approximately $10.7 billion at December 31, 2013 and $12.3 billion at December 31, 2012.