Income taxes (Details 3) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Components of profit (loss) before taxes
U.S	$ 2,131	$ 240	$ (2,053)
Non-U.S	5,691	3,842	2,192
Consolidated profit before taxes	7,822	4,082	139
Current tax provision (benefit):
U.S.	179	963	(90)
Non-U.S.	1,291	1,124	718
State (U.S.)	8	39	(5)
Current tax provision (benefit)	1,478	2,126	623
Deferred tax provision (benefit):
U.S.	298	1,385	(544)
Non-U.S.	4	(17)	(108)
State (U.S.)	(82)	(155)	221
Deferred tax provision (benefit)	220	1,213	(431)
Provision (benefit) for income taxes	1,698	3,339	192
Income Taxes Paid	$ 1,429	$ 1,404	$ 522