Other Liabilities (Schedule of Other Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Other Liabilities [Line Items]
Accrued environmental remediation costs	$ 337	$ 367
Miscellaneous	1,342	1,222
Total other liabilities	12,333	12,591
Pension Plan [Member]
Other Liabilities [Line Items]
Accrued benefit costs (Note 17)	8,100	8,478
Other Post Employment Benefit Plans [Member]
Other Liabilities [Line Items]
Accrued benefit costs (Note 17)	$ 2,554	$ 2,524