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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.

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