Other Liabilities (Schedule of Other Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Other Liabilities [Line Items]
Accrued environmental remediation costs	$ 374	$ 353
Miscellaneous	1,700	1,760
Total other liabilities	10,179	14,687
Other Long-Term Employee Benefit Plans [Member]
Other Liabilities [Line Items]
Accrued benefit costs (Note 18)	2,530	3,271
Pension Plans, Defined Benefit [Member]
Other Liabilities [Line Items]
Accrued benefit costs (Note 18)	$ 5,575	$ 9,303