Postretirement benefits Schedule of Net Funded Status (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Pension Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Service Cost	$ 60	$ 69	$ 80
Pension Plan [Member] | Non - U.S.
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation, beginning of year	942	1,077
Service Cost	11	12	17
Interest Cost	27	27	27
Actuarial Loss (gain)	124	(71)
Defined Benefit Plan, Benefit Obligation, Benefits Paid	(39)	(26)
Amendments	0	4
Curtailments	(4)	0
Settlements, Benefit obligations	(61)	(27)
Foreign currency revaluation, benefit obligations	42	(54)
Benefit Obligation, end of year	1,042	942	1,077
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at fair value, beginning of year	1,008	1,172
Actual Return on Plan Assets	169	(63)
Employer Contributions	16	14
Benefits Paid	(39)	(26)
Settlements	(61)	(27)
Foreign currency revaluation, Plan Assets	48	(62)
Plan assets at fair value, end of year	1,141	1,008	1,172
Defined Benefit Plan, Funded (Unfunded) Status of Plan	99	66
Pension Plan [Member] | UNITED STATES
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation, beginning of year	3,092	3,285
Service Cost	49	57	63
Interest Cost	118	105	105
Actuarial Loss (gain)	443	(214)
Defined Benefit Plan, Benefit Obligation, Benefits Paid	(121)	(108)
Amendments	0	0
Curtailments	0	0
Settlements, Benefit obligations	(12)	(33)
Foreign currency revaluation, benefit obligations	0	0
Benefit Obligation, end of year	3,569	3,092	3,285
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at fair value, beginning of year	2,784	3,109
Actual Return on Plan Assets	636	(218)
Employer Contributions	14	34
Benefits Paid	(121)	(108)
Settlements	(12)	(33)
Foreign currency revaluation, Plan Assets	0	0
Plan assets at fair value, end of year	3,301	2,784	3,109
Defined Benefit Plan, Funded (Unfunded) Status of Plan	(268)	(308)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation, beginning of year	113	137
Service Cost	0	1	2
Interest Cost	4	3	4
Actuarial Loss (gain)	3	(20)
Defined Benefit Plan, Benefit Obligation, Benefits Paid	(17)	(15)
Amendments	0	0
Curtailments	0	0
Settlements, Benefit obligations	0	0
Foreign currency revaluation, benefit obligations	0	7
Benefit Obligation, end of year	103	113	137
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at fair value, beginning of year	143	157
Actual Return on Plan Assets	9	1
Employer Contributions	0	0
Benefits Paid	0	(15)
Settlements	0	0
Foreign currency revaluation, Plan Assets	0	0
Plan assets at fair value, end of year	152	143	$ 157
Defined Benefit Plan, Funded (Unfunded) Status of Plan	$ 49	$ 30