Shareholders' Equity and Redeemable Non-controlling Interests, Shareholders' Equity, Reclassification out of accumulated other comprehensive income (loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Reclassification adjustments out of accumulated other comprehensive income (loss) [Line Items]
Other income (expense), net	$ 23	$ 11	$ 27	$ 46
Sales and other operating revenue	6,776	8,722	19,816	26,548
Cost of sales	5,885	7,269	17,647	22,257
Interest expense (income)	122	86	336	259
Income (loss) before income taxes	(11)	1,105	490	3,300
Provision for (benefit from) income taxes	(125)	136	(82)	508
Net income	114	965	572	2,785
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	104	(83)	126	(90)
Provision for (benefit from) income taxes	26	(24)	30	(23)
Net income	78	(59)	96	(67)
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	22	(25)	19	(28)
Net income	68	(64)	65	(82)
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	89	(86)	81	(99)
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	(10)	0	(18)
Cost of sales	0	8	0	12
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)	1	(1)	3	(5)
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	3	1
Amortization of actuarial (gain) loss	13	6	39	19
Provision for (benefit from) income taxes	4	1	11	5
Net income	$ 10	$ 5	$ 31	$ 15