Inventories (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Inventories [Abstract]
Raw materials	$ 375	$ 238
Work-in-process	1,015	894
Finished goods, including parts and subassemblies	2,067	2,208
Other	25	22
Gross Inventories	3,482	3,362
Excess of current standard costs over LIFO costs	(91)	(120)
Allowances	(123)	(109)
Total inventories	$ 3,268	$ 3,133