Commitments and Contingent Liabilities (Guarantees) (Details) (USD $) In Millions, unless otherwise specified																	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2011 Customer and Supplier Guarantee, Bank Borrowings [Member] years		Dec. 31, 2011 Customer and Supplier Guarantee, Leases on Equipment and Facilities [Member] years		Dec. 31, 2011 Equity Affiliates Guarantee, Bank Borrowings [Member] years		Dec. 31, 2011 Guarantee Obligations, Affilliates, Customers, Suppliers, Equity Affiliates [Member]	Dec. 31, 2011 Divested Subsidiaries Guarantee, Conoco [Member] years		Dec. 31, 2011 Divested Subsidiaries Guarantee, Other [Member] years	Dec. 31, 2011 Indemnification Agreements [Member]	Dec. 31, 2010 Indemnification Agreements [Member]	Dec. 31, 2011 Indemnification Purchase and Sale Agreement [Member]	Dec. 31, 2011 Financial Guarantee [Member]	Dec. 31, 2011 Indirect Guarantee of Indebtedness [Member]	Dec. 31, 2011 Customer and Supplier Guarantee [Member]	Dec. 31, 2011 Guaranteed Obligations, Short Term [Member]	Dec. 31, 2011 Guaranteed Obligations, Short Term [Member] Customer and Supplier Guarantee, Bank Borrowings [Member]		Dec. 31, 2011 Guaranteed Obligations, Short Term [Member] Customer and Supplier Guarantee, Leases on Equipment and Facilities [Member]		Dec. 31, 2011 Guaranteed Obligations, Short Term [Member] Equity Affiliates Guarantee, Bank Borrowings [Member]		Dec. 31, 2011 Guaranteed Obligations, Short Term [Member] Guarantee Obligations, Affilliates, Customers, Suppliers, Equity Affiliates [Member]	Dec. 31, 2011 Guaranteed Obligations, Short Term [Member] Divested Subsidiaries Guarantee, Conoco [Member]		Dec. 31, 2011 Guaranteed Obligations, Short Term [Member] Divested Subsidiaries Guarantee, Other [Member]	Dec. 31, 2011 Guarantee Obligations, Long Term [Member]	Dec. 31, 2011 Guarantee Obligations, Long Term [Member] Customer and Supplier Guarantee, Bank Borrowings [Member]		Dec. 31, 2011 Guarantee Obligations, Long Term [Member] Customer and Supplier Guarantee, Leases on Equipment and Facilities [Member]		Dec. 31, 2011 Guarantee Obligations, Long Term [Member] Equity Affiliates Guarantee, Bank Borrowings [Member]		Dec. 31, 2011 Guarantee Obligations, Long Term [Member] Guarantee Obligations, Affilliates, Customers, Suppliers, Equity Affiliates [Member]	Dec. 31, 2011 Guarantee Obligations, Long Term [Member] Divested Subsidiaries Guarantee, Conoco [Member]		Dec. 31, 2011 Guarantee Obligations, Long Term [Member] Divested Subsidiaries Guarantee, Other [Member]
Guarantor Obligations [Line Items]
Indemnifications, carrying amount												$ 105	$ 100	$ 70
Guarantee obligations	$ 583	$ 361	[1]	$ 1	[1]	$ 201	[2]	$ 563	$ 16	[3]	$ 4			$ 1,400	$ 563	$ 20	$ 362	$ 477	$ 278	[1]	$ 0	[1]	$ 199	[2]	$ 477	$ 0	[3]	$ 0	$ 106	$ 83	[1]	$ 1	[1]	$ 2	[2]	$ 86	$ 16	[3]	$ 4
Collateral assets and personal guarantees percentage																	50.00%
Guaranteed obligations maximum term		5		3		2			15		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.

[3] The company has guaranteed certain obligations and liabilities related to a divested subsidiary, Conoco, which has indemnified the company for any liabilities the company may incur pursuant to these guarantees.