Other Accrued Liabilities (Schedule of Other Accrued Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Accrued Liabilities, Current [Abstract]
Compensation and other employee-related costs	$ 1,092	$ 1,189
Deferred revenue	2,706	2,153
Employee benefits (Note 18)	367	423
Discounts and rebates	318	356
Derivative instruments	131	36
Miscellaneous	1,383	1,140
Total other accrued liabilities	$ 5,997	$ 5,297