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Commitments and Contingent Liabilities Commitments and Contingent Liabilities (Obligations for Equity Affilliates and Others) (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2011
Dec. 31, 2010
Guarantee obligations$ 566 
Financial Guarantee [Member]
  
Guarantee obligations550544
Indirect Guarantee of Indebtedness [Member]
  
Guarantee obligations16 
Performance Guarantee [Member]
  
Guarantor obligations, current carrying value120109
Customer and Supplier Guarantee [Member]
  
Collateral assets and personal guarantees percentage39.00% 
Guarantee obligations$ 313[1] 
[1]Existing guarantees for customers and suppliers arose as part of contractual agreements.