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Employee Benefit Plans - Before-Tax Amounts not Recognized in Net Periodic Benefit Cost and Sources of Change in Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax [Abstract] |  |  |
Net actuarial gain (loss) arising during the period | $ (623) | $ 357 | $ (210)
Amortization of actuarial loss included in income (loss) | 72 | 178 | 117
Prior service credit (cost) arising during the period | (10) | 0 | 29
Amortization of prior service (credit) included in income (loss) | (39) | (38) | $ (32)
Pension Benefits | United States |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax [Abstract] |  |  |
Net actuarial gain (loss) arising during the period | (44) | 134 |
Amortization of actuarial loss included in income (loss) | 61 | 145 |
Net change during the period | 17 | 279 |
Prior service credit (cost) arising during the period | 0 | 0 |
Amortization of prior service (credit) included in income (loss) | 0 | 0 |
Net change during the period | 0 | 0 |
Pension Benefits | Int’l. |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax [Abstract] |  |  |
Net actuarial gain (loss) arising during the period | (606) | 207 |
Amortization of actuarial loss included in income (loss) | 11 | 33 |
Net change during the period | (595) | 240 |
Prior service credit (cost) arising during the period | (1) | 0 |
Amortization of prior service (credit) included in income (loss) | (1) | (1) |
Net change during the period | (2) | (1) |
Other Benefits |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax [Abstract] |  |  |
Net actuarial gain (loss) arising during the period | 27 | 16 |
Amortization of actuarial loss included in income (loss) | 0 | 0 |
Net change during the period | 27 | 16 |
Prior service credit (cost) arising during the period | (9) | 0 |
Amortization of prior service (credit) included in income (loss) | (38) | (37) |
Net change during the period | $ (47) | $ (37) |

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- Definition Amount, before tax, after reclassification adjustment, of increase (decrease) in accumulated other comprehensive income from gain (loss) of defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI https://asc.fasb.org/extlink&oid=126968391&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669646-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive income from prior service cost (credit) of defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI https://asc.fasb.org/extlink&oid=126968391&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (j) -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669646-108580 + Details
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- Definition Amount, before tax, of cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (j) -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669646-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI https://asc.fasb.org/extlink&oid=126968391&loc=d3e637-108580 + Details
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