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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
Jun. 30, 2011
Dec. 31, 2010
Guarantee obligations $ 537  
Financial Guarantee [Member]
   
Guarantee obligations 521 544
Indirect Guarantee of Indebtedness [Member]
   
Guarantee obligations 16  
Performance Guarantee [Member]
   
Guarantor obligations, current carrying value 116 109
Customer and Supplier Guarantee [Member]
   
Collateral assets and personal guarantees percentage 36.00%  
Guarantee obligations $ 275 [1]  
[1] Existing guarantees for customers and suppliers arose as part of contractual agreements.