Shareholders' Equity and Redeemable Non-controlling Interests, Shareholders' Equity, Reclassification out of accumulated other comprehensive income (loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Reclassification adjustments out of accumulated other comprehensive income (loss) [Line Items]
Other income (expense), net	$ 4	$ 10	$ 4	$ 35
Sales and other operating revenue	5,546	9,048	13,040	17,826
Cost of sales	4,894	7,542	11,762	14,988
Interest expense (income)	125	81	214	173
Income (loss) before income taxes	283	1,175	501	2,195
Provision for (benefit from) income taxes	(32)	169	43	372
Net income	314	1,003	458	1,820
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	61	31	22	(7)
Provision for (benefit from) income taxes	15	9	4	1
Net income	46	22	18	(8)
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	12	7	(3)	(3)
Net income	35	17	(3)	(18)
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	45	26	(8)	(13)
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	(2)	0	(8)
Cost of sales	0	0	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)	2	0	2	(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	1	2	1
Amortization of actuarial (gain) loss	13	6	26	13
Provision for (benefit from) income taxes	3	2	7	4
Net income	$ 11	$ 5	$ 21	$ 10