Postretirement benefits Schedule of Net Funded Status (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Pension Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Service Cost	$ 4	$ 60	$ 69
Pension Plan [Member] | Non - U.S.
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation, beginning of year	1,042	942
Service Cost	4	11	12
Interest Cost	22	27	27
Actuarial Loss (gain)	135	124
Defined Benefit Plan, Benefit Obligation, Benefits Paid	(31)	(39)
Curtailments	(2)	(4)
Settlements, Benefit obligations	0	(61)
Foreign currency revaluation, benefit obligations	29	42
Benefit Obligation, end of year	1,199	1,042	942
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at fair value, beginning of year	1,141	1,008
Actual Return on Plan Assets	126	169
Employer Contributions	19	16
Benefits Paid	(31)	(39)
Settlements	0	(61)
Foreign currency revaluation, Plan Assets	29	48
Plan assets at fair value, end of year	1,284	1,141	1,008
Defined Benefit Plan, Funded (Unfunded) Status of Plan	85	99
Pension Plan [Member] | UNITED STATES
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation, beginning of year	3,569	3,092
Service Cost	0	49	57
Interest Cost	99	118	105
Actuarial Loss (gain)	441	443
Defined Benefit Plan, Benefit Obligation, Benefits Paid	(127)	(121)
Curtailments	0	0
Settlements, Benefit obligations	(15)	(12)
Foreign currency revaluation, benefit obligations	0	0
Benefit Obligation, end of year	3,967	3,569	3,092
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at fair value, beginning of year	3,301	2,784
Actual Return on Plan Assets	563	636
Employer Contributions	17	14
Benefits Paid	(127)	(121)
Settlements	(15)	(12)
Foreign currency revaluation, Plan Assets	0	0
Plan assets at fair value, end of year	3,739	3,301	2,784
Defined Benefit Plan, Funded (Unfunded) Status of Plan	(228)	(268)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation, beginning of year	103	113
Service Cost	1	0	1
Interest Cost	2	4	3
Actuarial Loss (gain)	1	3
Defined Benefit Plan, Benefit Obligation, Benefits Paid	(20)	(17)
Curtailments	0	0
Settlements, Benefit obligations	0	0
Foreign currency revaluation, benefit obligations	(1)	0
Benefit Obligation, end of year	86	103	113
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at fair value, beginning of year	152	143
Actual Return on Plan Assets	6	9
Employer Contributions	1	0
Benefits Paid	(39)	0
Settlements	0	0
Foreign currency revaluation, Plan Assets	0	0
Plan assets at fair value, end of year	120	152	$ 143
Defined Benefit Plan, Funded (Unfunded) Status of Plan	$ 34	$ 49