Other Income/(Loss) (Details) - Operating Segments [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Non-Financial Services
Net periodic pension and OPEB income/(cost), excluding service cost	$ 389	$ 297	$ 779	$ 661
Investment-related interest income	85	52	156	113
Interest income/(expense) on income taxes	(1)	1	2	(1)
Realized and unrealized gains/(losses) on cash equivalents and marketable securities	(24)	(7)	25	65
Gains/(Losses) on changes in investments in affiliates	(1)	147	(2)	181
Royalty income	150	137	304	320
Other	60	59	106	115
Total	658	686	1,370	1,454
Financial Services
Investment-related interest income	24	20	45	39
Interest income/(expense) on income taxes	1	15	(1)	13
Insurance premiums earned	0	41		80
Other	49	6	52	41
Total	$ 74	$ 82	$ 96	$ 173