Debt And Lines Of Credit (Narrative) (Details) (USD $)	12 Months Ended						12 Months Ended		1 Months Ended		1 Months Ended	12 Months Ended	1 Months Ended		12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Feb. 13, 2012	Dec. 31, 2007	Dec. 31, 2006	Dec. 31, 2012 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, 2012 Credit Facility Agreements [Member]	Aug. 31, 2016 Line Of Credit Expires August 2016 [Member]	Dec. 31, 2012 Line Of Credit Expires August 2016 [Member]	Jan. 31, 2014 Receivables Securitization Program [Member]	Jan. 31, 2013 Receivables Securitization Program [Member]	Dec. 31, 2012 Receivables Securitization Program [Member]	Dec. 31, 2012 Floating Rate Notes Due Two Thousand Eleven To Two Thousand Seventeen [Member]		Dec. 31, 2011 Floating Rate Notes Due Two Thousand Eleven To Two Thousand Seventeen [Member]		Dec. 31, 2012 Environmental And Industrial Development Bonds Due Two Thousand Eleven To Two Thousand Thirty Five [Member]		Dec. 31, 2011 Environmental And Industrial Development Bonds Due Two Thousand Eleven To Two Thousand Thirty Five [Member]		Dec. 31, 2012 Short Term Notes [Member]	Dec. 31, 2011 Short Term Notes [Member]	Dec. 31, 2012 Foreign Denominated Debt And Commercial Loans [Member]	Dec. 31, 2011 Foreign Denominated Debt And Commercial Loans [Member]	Dec. 31, 2012 Long Term Debt Other [Member]		Dec. 31, 2011 Long Term Debt Other [Member]		Dec. 31, 2012 Interest Rate Swap Unwind [Member] Long Term Debt Other [Member]	Dec. 31, 2011 Interest Rate Swap Unwind [Member] Long Term Debt Other [Member]
Debt Instrument [Line Items]
Long term debt, face amount								$ 1,200,000,000	$ 200,000,000
Maturity date									2017
Repayment of loan							1,200,000,000
Interest rates range, minimum	1.625%
Interest rates range, maximum	9.375%
Original maturity date range, minimum	2010	2010	2010
Original maturity date range, maximum	2041	2039	2039
Long-term debt					2,140,000,000											314,000,000	[1]	356,000,000	[1]	1,812,000,000	[2]	1,958,000,000	[2]			29,000,000	173,000,000	331,000,000	[3]	152,000,000	[3]
Weighted average interest rate																2.60%		1.90%		5.60%		5.50%		2.20%	5.00%	5.60%	5.90%
Unamortized gain (loss) on interest rate swap unwinds																																61,000,000	79,000,000
Debt fair value	12,300,000,000	11,200,000,000
Debt obligations payable to non-consolidated variable interest entities	5,300,000,000
Principal payment of debt obligations to non-consolidated variable interest entities in 2016	5,300,000,000
Debt and capital lease obligations						5,300,000,000
Debt obligations offset against Class B interests	5,200,000,000
Maturities of long-term debt, 2013	444,000,000
Maturities of long-term debt, 2014	708,000,000
Maturities of long-term debt, 2015	479,000,000
Maturities of long-term debt, 2016	571,000,000
Maturities of long-term debt, 2017	216,000,000
Contractually committed credit facilities										2,500,000,000
Revolving credit facilities available												1,500,000,000
Line of credit, maturity date											Aug. 26, 2016
Interest rate								1.38%	1.75%
Available commercial paper-based financings															1,000,000,000
Maturity date, range low														January 2013		2011				2011
Maturity date, range high													January 2014			2017				2035
Credit agreement facility fee												0.175%			0.35%
Commercial paper-based financings agreement value				$ 250,000,000						$ 1,000,000,000

[1] The weighted average interest rate on these notes was 2.6% in 2012 and 1.9% in 2011.

[2] The weighted average interest rate on these bonds was 5.6% in 2012 and 5.5% in 2011.

[3] Includes $61 million at December 31, 2012 and $79 million at December 31, 2011, related to the unamortized gain on interest rate swap unwinds (see Note 13).