Shareholders' Equity and Redeemable Non-controlling Interests, Shareholders' Equity, Reclassification out of accumulated other comprehensive income (loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Reclassification adjustments out of accumulated other comprehensive income (loss) [Line Items]
Other income (expense), net	$ 0	$ 25
Sales and other operating revenue	7,494	8,778
Cost of sales	6,868	7,446
Interest expense (income)	89	92
Income (loss) before income taxes	218	1,020
Provision for (benefit from) income taxes	75	203
Net income	144	817
Amounts reclassified out of accumulated other comprehensive income (loss) [Member]
Reclassification adjustments out of accumulated other comprehensive income (loss) [Line Items]
Income (loss) before income taxes	(39)	(38)
Provision for (benefit from) income taxes	(11)	(8)
Net income	(28)	(30)
Financial derivatives [Member] | Amounts reclassified out of accumulated other comprehensive income (loss) [Member]
Reclassification adjustments out of accumulated other comprehensive income (loss) [Line Items]
Provision for (benefit from) income taxes	(15)	(10)
Net income	(38)	(35)
Financial derivatives [Member] | Foreign currency [Member] | Amounts reclassified out of accumulated other comprehensive income (loss) [Member]
Reclassification adjustments out of accumulated other comprehensive income (loss) [Line Items]
Other income (expense), net	(53)	(39)
Financial derivatives [Member] | Commodities [Member] | Amounts reclassified out of accumulated other comprehensive income (loss) [Member]
Reclassification adjustments out of accumulated other comprehensive income (loss) [Line Items]
Sales and other operating revenue	0	(6)
Cost of sales	0	4
Financial derivatives [Member] | Interest rate contract [Member] | Amounts reclassified out of accumulated other comprehensive income (loss) [Member]
Reclassification adjustments out of accumulated other comprehensive income (loss) [Line Items]
Interest expense (income)	0	(4)
Amortization of defined pension items [Member] | Amounts reclassified out of accumulated other comprehensive income (loss) [Member]
Reclassification adjustments out of accumulated other comprehensive income (loss) [Line Items]
Amortization of prior service cost (benefit)	1	0
Amortization of actuarial (gain) loss	13	7
Provision for (benefit from) income taxes	4	2
Net income	$ 10	$ 5