Guarantees (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Product Warranty Liability [Line Items]
Balance as of January 1	$ 1,212	$ 1,264
Warranties and performance guarantees issued	218	208
Settlements made	192	217
Other	0	(56)
Balance as of September 30	$ 1,238	1,199
Discontinued Operations, Disposed of by Sale [Member]
Product Warranty Liability [Line Items]
Balance as of September 30		$ 42