Commitments and Contingent Liabilities (Schedule of Guaranteed Obligations) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2011		Dec. 31, 2010
Guarantee obligations	$ 566
Financial Guarantee [Member]
Guarantee obligations	550		544
Indirect Guarantee of Indebtedness [Member]
Guarantee obligations	16
Customer and Supplier Guarantee, Bank Borrowings [Member]
Guarantee obligations	312	[1]
Guaranteed obligations, maximum term (in years)	5
Customer and Supplier Guarantee, Bank Borrowings [Member] | Short-Term [Member]
Guarantee obligations	142	[1]
Customer and Supplier Guarantee, Bank Borrowings [Member] | Long-Term [Member]
Guarantee obligations	170	[1]
Customer and Supplier Guarantee, Equipment and Facility Leases [Member]
Guarantee obligations	1	[1]
Guaranteed obligations, maximum term (in years)	4
Customer and Supplier Guarantee, Equipment and Facility Leases [Member] | Short-Term [Member]
Guarantee obligations	0	[1]
Customer and Supplier Guarantee, Equipment and Facility Leases [Member] | Long-Term [Member]
Guarantee obligations	1	[1]
Other Affiliated Companies, Bank Borrowings [Member]
Guarantee obligations	195	[2]
Guaranteed obligations, maximum term (in years)	1
Other Affiliated Companies, Bank Borrowings [Member] | Short-Term [Member]
Guarantee obligations	195	[2]
Other Affiliated Companies, Bank Borrowings [Member] | Long-Term [Member]
Guarantee obligations	0	[2]
Equity Affiliates, Bank Borrowings [Member]
Guarantee obligations	19	[2]
Guaranteed obligations, maximum term (in years)	2
Equity Affiliates, Bank Borrowings [Member] | Short-Term [Member]
Guarantee obligations	13	[2]
Equity Affiliates, Bank Borrowings [Member] | Long-Term [Member]
Guarantee obligations	6	[2]
Equity Affiliates Guarantee, Revenue Bonds [Member]
Guarantee obligations	23	[2]
Guaranteed obligations, maximum term (in years)	4
Equity Affiliates Guarantee, Revenue Bonds [Member] | Short-Term [Member]
Guarantee obligations	0	[2]
Equity Affiliates Guarantee, Revenue Bonds [Member] | Long-Term [Member]
Guarantee obligations	23	[2]
Total Obligations for Customers, Suppliers, Other Affiliated Companies, and Equity Affiliates [Member]
Guarantee obligations	550
Total Obligations for Customers, Suppliers, Other Affiliated Companies, and Equity Affiliates [Member] | Short-Term [Member]
Guarantee obligations	350
Total Obligations for Customers, Suppliers, Other Affiliated Companies, and Equity Affiliates [Member] | Long-Term [Member]
Guarantee obligations	200
Divested Subsidiaries, Conoco [Member]
Guarantee obligations	16	[3]
Guaranteed obligations, maximum term (in years)	15
Divested Subsidiaries, Conoco [Member] | Short-Term [Member]
Guarantee obligations	0	[3]
Divested Subsidiaries, Conoco [Member] | Long-Term [Member]
Guarantee obligations	16	[3]
Divested Subsidiaries [Member]
Guarantee obligations	16
Divested Subsidiaries [Member] | Short-Term [Member]
Guarantee obligations	0
Divested Subsidiaries [Member] | Long-Term [Member]
Guarantee obligations	16
Short-Term [Member]
Guarantee obligations	350
Long-Term [Member]
Guarantee obligations	$ 216

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

[2] Existing guarantees for equity affiliates and other affiliated companies 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.