Commitments and Contingent Liabilities (Guarantees) (Details) (USD $) In Millions, unless otherwise specified					3 Months Ended
	Mar. 31, 2012	Mar. 31, 2012 Indemnification Agreements [Member]	Dec. 31, 2011 Indemnification Agreements [Member]	Mar. 31, 2012 Indemnification Purchase and Sale Agreement [Member]	Mar. 31, 2012 Customer and Supplier Guarantee, Bank Borrowings [Member] Y		Mar. 31, 2012 Equity Affiliates, Bank Borrowings [Member] Y		Mar. 31, 2012 Total Obligations for Customers, Suppliers, and Equity Affiliates [Member]	Dec. 31, 2011 Total Obligations for Customers, Suppliers, and Equity Affiliates [Member]	Mar. 31, 2012 Divested Subsidiaries Guarantee [Member] Y	Dec. 31, 2011 Divested Subsidiaries Guarantee [Member]	Mar. 31, 2012 Guaranteed Obligations, Short-Term [Member]	Mar. 31, 2012 Guaranteed Obligations, Short-Term [Member] Customer and Supplier Guarantee, Bank Borrowings [Member]		Mar. 31, 2012 Guaranteed Obligations, Short-Term [Member] Equity Affiliates, Bank Borrowings [Member]		Mar. 31, 2012 Guaranteed Obligations, Short-Term [Member] Total Obligations for Customers, Suppliers, and Equity Affiliates [Member]	Mar. 31, 2012 Guaranteed Obligations, Short-Term [Member] Divested Subsidiaries Guarantee [Member]	Mar. 31, 2012 Guaranteed Obligations, Long-Term [Member]	Mar. 31, 2012 Guaranteed Obligations, Long-Term [Member] Customer and Supplier Guarantee, Bank Borrowings [Member]		Mar. 31, 2012 Guaranteed Obligations, Long-Term [Member] Equity Affiliates, Bank Borrowings [Member]		Mar. 31, 2012 Guaranteed Obligations, Long-Term [Member] Total Obligations for Customers, Suppliers, and Equity Affiliates [Member]	Mar. 31, 2012 Guaranteed Obligations, Long-Term [Member] Divested Subsidiaries Guarantee [Member]
Guarantor Obligations [Line Items]
Indemnifications, carrying amount		$ 105	$ 105	$ 70
Guarantee obligations	$ 546			$ 1,400	$ 323	[1]	$ 203	[2]	$ 526	$ 563	$ 20	$ 20	$ 460	$ 243	[1]	$ 201	[2]	$ 444	$ 16	$ 86	$ 80	[1]	$ 2	[2]	$ 82	$ 4
Collateral assets and personal guarantees percentage					53.00%
Guaranteed obligations, maximum term					5		2				6

[1] Existing guarantees for customers and suppliers arose as part of contractual agreements.

[2] Existing guarantees for equity affiliates arose for liquidity needs in normal operations.