Debt And Lines Of Credit (Narrative) (Details) (USD $)		12 Months Ended				1 Months Ended		1 Months Ended	12 Months Ended			12 Months Ended
	Dec. 31, 2013	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 1.38% Variable Rate Term Loan [Member]	Feb. 29, 2012 1.38% Variable Rate Term Loan [Member]	Feb. 29, 2012 1.75% Variable Rate Term Loan [Member]	Dec. 31, 2013 Credit Facility Agreements [Member]	Aug. 31, 2016 Revolving Credit Facility [Member]	Dec. 31, 2013 Revolving Credit Facility [Member]	Jan. 31, 2014 Receivables Securitization Program [Member]	Dec. 31, 2013 Receivables Securitization Program [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 Foreign Corporate Debt Securities [Member]	Dec. 31, 2012 Foreign Corporate Debt Securities [Member]
Schedule of Debt Activity [Line Items]
Long Term Debt, Maturity Date		2041	2041											2022	2022
Debt instrument, interest rate during period																2.60%	2.60%	5.50%	5.60%	2.80%	2.20%	5.80%	5.60%
Debt Instrument, Interest Rate, Stated Percentage					1.38%	1.75%
Long term debt, face amount					$ 1,200,000,000	$ 200,000,000
Maturity date, range low						Feb. 13, 2017
Repayment of loan				1,200,000,000
Debt and capital lease obligations	5,300,000,000
Principal payment of debt obligations to non-consolidated variable interest entities in 2016	5,300,000,000
Debt obligations offset against Class B interests	5,200,000,000
Maturities of long-term debt, 2013	661,000,000
Maturities of long-term debt, 2014	498,000,000
Maturities of long-term debt, 2015	571,000,000
Maturities of long-term debt, 2016	285,000,000
Maturities of long-term debt, 2017	1,837,000,000
Contractually committed credit facilities							2,500,000,000
Revolving credit facilities available									1,500,000,000
Line of credit, maturity date								Aug. 26, 2016
Credit agreement facility fee									0.175%
Commercial paper-based financings agreement value										500,000,000	1,000,000,000
Available commercial paper-based financings											$ 958,000,000
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum		6.00%	6.00%									5.25%	5.25%	4.75%	4.75%
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum												5.50%	5.50%
Debt Instrument Original Maturity Date Minimum												2014	2014			2013	2012	2013	2012
Debt Instrument Original Maturity Date Maximum												2016	2016			2017	2017	2035	2035