Guarantees (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Product Warranty Liability [Line Items]
Balance as of January 1	$ 1,212	$ 1,264
Warranties and performance guarantees issued	154	133
Settlements made	131	136
Other	6	(19)
Balance as of June 30	1,241	$ 1,242
Discontinued Operations, Disposed of by Sale [Member]
Product Warranty Liability [Line Items]
Balance as of June 30	$ 43