Equity, Reclassification Out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Loss [Line Items]
Other income, net		$ 16	$ 132	$ 104
Total before tax		1,543	(2,010)	3,486
Tax (expense) benefit		(255)	903	(702)
Net income (loss)		1,288	(1,107)	2,784
Revenues	[1]	113,977	64,912	108,324
Reclassification out of Accumulated Other Comprehensive Loss [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Loss [Line Items]
Net income (loss)		(90)	(11)	(8)
Net Gain (Loss) on Pension and Other Postretirement Benefits [Member] | Reclassification out of Accumulated Other Comprehensive Loss [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Loss [Line Items]
Total before tax		(63)	(53)	(14)
Tax (expense) benefit		14	12	4
Net income (loss)		(49)	(41)	(10)
Net Actuarial Loss [Member] | Reclassification out of Accumulated Other Comprehensive Loss [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Loss [Line Items]
Other income, net	[2]	(80)	(74)	(38)
Prior Service Credit [Member] | Reclassification out of Accumulated Other Comprehensive Loss [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Loss [Line Items]
Other income, net	[2]	25	26	28
Curtailment and Settlement [Member] | Reclassification out of Accumulated Other Comprehensive Loss [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Loss [Line Items]
Other income, net	[2]	(8)	(5)	(4)
Gains (Losses) on Cash Flow Hedges [Member[ | Reclassification out of Accumulated Other Comprehensive Loss [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Loss [Line Items]
Total before tax		(46)	34	2
Tax (expense) benefit		5	(4)	0
Net income (loss)		(41)	30	2
Gains (Losses) on Cash Flow Hedges [Member[ | Reclassification out of Accumulated Other Comprehensive Loss [Member] | Commodity Contracts [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Loss [Line Items]
Revenues		$ (46)	$ 34	$ 2

[1] Includes excise taxes on sales by certain of our foreign operations of $5,645 million, $4,797 million, and $5,595 million for the years ended December 31, 2021, 2020, and 2019.

[2] These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost, as discussed in Note 14.